diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2321afc1b0b..139d1bd46cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -954,7 +954,7 @@ endif (gRPC_BUILD_TESTS)
 
 add_library(grpc
   src/core/lib/surface/init.cc
-  src/core/lib/backoff/backoff.c
+  src/core/lib/backoff/backoff.cc
   src/core/lib/channel/channel_args.cc
   src/core/lib/channel/channel_stack.cc
   src/core/lib/channel/channel_stack_builder.cc
@@ -1306,7 +1306,7 @@ endif()
 
 add_library(grpc_cronet
   src/core/lib/surface/init.cc
-  src/core/lib/backoff/backoff.c
+  src/core/lib/backoff/backoff.cc
   src/core/lib/channel/channel_args.cc
   src/core/lib/channel/channel_stack.cc
   src/core/lib/channel/channel_stack_builder.cc
@@ -1626,7 +1626,7 @@ add_library(grpc_test_util
   test/core/util/port_server_client.c
   test/core/util/slice_splitter.c
   test/core/util/trickle_endpoint.c
-  src/core/lib/backoff/backoff.c
+  src/core/lib/backoff/backoff.cc
   src/core/lib/channel/channel_args.cc
   src/core/lib/channel/channel_stack.cc
   src/core/lib/channel/channel_stack_builder.cc
@@ -1890,7 +1890,7 @@ add_library(grpc_test_util_unsecure
   test/core/util/port_server_client.c
   test/core/util/slice_splitter.c
   test/core/util/trickle_endpoint.c
-  src/core/lib/backoff/backoff.c
+  src/core/lib/backoff/backoff.cc
   src/core/lib/channel/channel_args.cc
   src/core/lib/channel/channel_stack.cc
   src/core/lib/channel/channel_stack_builder.cc
@@ -2140,7 +2140,7 @@ endif (gRPC_BUILD_TESTS)
 add_library(grpc_unsecure
   src/core/lib/surface/init.cc
   src/core/lib/surface/init_unsecure.cc
-  src/core/lib/backoff/backoff.c
+  src/core/lib/backoff/backoff.cc
   src/core/lib/channel/channel_args.cc
   src/core/lib/channel/channel_stack.cc
   src/core/lib/channel/channel_stack_builder.cc
@@ -2898,7 +2898,7 @@ add_library(grpc++_cronet
   src/core/ext/transport/chttp2/transport/stream_map.cc
   src/core/ext/transport/chttp2/transport/varint.cc
   src/core/ext/transport/chttp2/transport/writing.cc
-  src/core/lib/backoff/backoff.c
+  src/core/lib/backoff/backoff.cc
   src/core/lib/channel/channel_args.cc
   src/core/lib/channel/channel_stack.cc
   src/core/lib/channel/channel_stack_builder.cc
diff --git a/Makefile b/Makefile
index 72aae9f2f6f..382956dc44e 100644
--- a/Makefile
+++ b/Makefile
@@ -2945,7 +2945,7 @@ endif
 
 LIBGRPC_SRC = \
     src/core/lib/surface/init.cc \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
@@ -3297,7 +3297,7 @@ endif
 
 LIBGRPC_CRONET_SRC = \
     src/core/lib/surface/init.cc \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
@@ -3616,7 +3616,7 @@ LIBGRPC_TEST_UTIL_SRC = \
     test/core/util/port_server_client.c \
     test/core/util/slice_splitter.c \
     test/core/util/trickle_endpoint.c \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
@@ -3871,7 +3871,7 @@ LIBGRPC_TEST_UTIL_UNSECURE_SRC = \
     test/core/util/port_server_client.c \
     test/core/util/slice_splitter.c \
     test/core/util/trickle_endpoint.c \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
@@ -4099,7 +4099,7 @@ endif
 LIBGRPC_UNSECURE_SRC = \
     src/core/lib/surface/init.cc \
     src/core/lib/surface/init_unsecure.cc \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
@@ -4840,7 +4840,7 @@ LIBGRPC++_CRONET_SRC = \
     src/core/ext/transport/chttp2/transport/stream_map.cc \
     src/core/ext/transport/chttp2/transport/varint.cc \
     src/core/ext/transport/chttp2/transport/writing.cc \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
diff --git a/binding.gyp b/binding.gyp
index e10532e8e9e..91919c33305 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -657,7 +657,7 @@
       ],
       'sources': [
         'src/core/lib/surface/init.cc',
-        'src/core/lib/backoff/backoff.c',
+        'src/core/lib/backoff/backoff.cc',
         'src/core/lib/channel/channel_args.cc',
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
diff --git a/build.yaml b/build.yaml
index ead40766d88..d23716af2af 100644
--- a/build.yaml
+++ b/build.yaml
@@ -182,7 +182,7 @@ filegroups:
   - grpc++_codegen_base
 - name: grpc_base
   src:
-  - src/core/lib/backoff/backoff.c
+  - src/core/lib/backoff/backoff.cc
   - src/core/lib/channel/channel_args.cc
   - src/core/lib/channel/channel_stack.cc
   - src/core/lib/channel/channel_stack_builder.cc
diff --git a/config.m4 b/config.m4
index c583ec4ea85..5d92a2ae348 100644
--- a/config.m4
+++ b/config.m4
@@ -85,7 +85,7 @@ if test "$PHP_GRPC" != "no"; then
     src/core/lib/support/tmpfile_windows.cc \
     src/core/lib/support/wrap_memcpy.cc \
     src/core/lib/surface/init.cc \
-    src/core/lib/backoff/backoff.c \
+    src/core/lib/backoff/backoff.cc \
     src/core/lib/channel/channel_args.cc \
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
diff --git a/config.w32 b/config.w32
index 20ccf3a0689..67b5e2f5543 100644
--- a/config.w32
+++ b/config.w32
@@ -62,7 +62,7 @@ if (PHP_GRPC != "no") {
     "src\\core\\lib\\support\\tmpfile_windows.cc " +
     "src\\core\\lib\\support\\wrap_memcpy.cc " +
     "src\\core\\lib\\surface\\init.cc " +
-    "src\\core\\lib\\backoff\\backoff.c " +
+    "src\\core\\lib\\backoff\\backoff.cc " +
     "src\\core\\lib\\channel\\channel_args.cc " +
     "src\\core\\lib\\channel\\channel_stack.cc " +
     "src\\core\\lib\\channel\\channel_stack_builder.cc " +
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 659ea07ba61..08ef7387322 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -460,7 +460,7 @@ Pod::Spec.new do |s|
                       'src/core/ext/filters/workarounds/workaround_cronet_compression_filter.h',
                       'src/core/ext/filters/workarounds/workaround_utils.h',
                       'src/core/lib/surface/init.cc',
-                      'src/core/lib/backoff/backoff.c',
+                      'src/core/lib/backoff/backoff.cc',
                       'src/core/lib/channel/channel_args.cc',
                       'src/core/lib/channel/channel_stack.cc',
                       'src/core/lib/channel/channel_stack_builder.cc',
diff --git a/grpc.gemspec b/grpc.gemspec
index fd3010b0441..ce23e6f7df5 100644
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -407,7 +407,7 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/ext/filters/workarounds/workaround_cronet_compression_filter.h )
   s.files += %w( src/core/ext/filters/workarounds/workaround_utils.h )
   s.files += %w( src/core/lib/surface/init.cc )
-  s.files += %w( src/core/lib/backoff/backoff.c )
+  s.files += %w( src/core/lib/backoff/backoff.cc )
   s.files += %w( src/core/lib/channel/channel_args.cc )
   s.files += %w( src/core/lib/channel/channel_stack.cc )
   s.files += %w( src/core/lib/channel/channel_stack_builder.cc )
diff --git a/grpc.gyp b/grpc.gyp
index a38b2a36761..53e388561f9 100644
--- a/grpc.gyp
+++ b/grpc.gyp
@@ -223,7 +223,7 @@
       ],
       'sources': [
         'src/core/lib/surface/init.cc',
-        'src/core/lib/backoff/backoff.c',
+        'src/core/lib/backoff/backoff.cc',
         'src/core/lib/channel/channel_args.cc',
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
@@ -525,7 +525,7 @@
         'test/core/util/port_server_client.c',
         'test/core/util/slice_splitter.c',
         'test/core/util/trickle_endpoint.c',
-        'src/core/lib/backoff/backoff.c',
+        'src/core/lib/backoff/backoff.cc',
         'src/core/lib/channel/channel_args.cc',
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
@@ -732,7 +732,7 @@
         'test/core/util/port_server_client.c',
         'test/core/util/slice_splitter.c',
         'test/core/util/trickle_endpoint.c',
-        'src/core/lib/backoff/backoff.c',
+        'src/core/lib/backoff/backoff.cc',
         'src/core/lib/channel/channel_args.cc',
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
@@ -924,7 +924,7 @@
       'sources': [
         'src/core/lib/surface/init.cc',
         'src/core/lib/surface/init_unsecure.cc',
-        'src/core/lib/backoff/backoff.c',
+        'src/core/lib/backoff/backoff.cc',
         'src/core/lib/channel/channel_args.cc',
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
diff --git a/package.xml b/package.xml
index 0b527d78db2..df0142124d5 100644
--- a/package.xml
+++ b/package.xml
@@ -419,7 +419,7 @@
     <file baseinstalldir="/" name="src/core/ext/filters/workarounds/workaround_cronet_compression_filter.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/workarounds/workaround_utils.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/surface/init.cc" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/backoff/backoff.c" role="src" />
+    <file baseinstalldir="/" name="src/core/lib/backoff/backoff.cc" role="src" />
     <file baseinstalldir="/" name="src/core/lib/channel/channel_args.cc" role="src" />
     <file baseinstalldir="/" name="src/core/lib/channel/channel_stack.cc" role="src" />
     <file baseinstalldir="/" name="src/core/lib/channel/channel_stack_builder.cc" role="src" />
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index e60dfb7c2c4..140f4ceee12 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -61,7 +61,7 @@ CORE_SOURCE_FILES = [
   'src/core/lib/support/tmpfile_windows.cc',
   'src/core/lib/support/wrap_memcpy.cc',
   'src/core/lib/surface/init.cc',
-  'src/core/lib/backoff/backoff.c',
+  'src/core/lib/backoff/backoff.cc',
   'src/core/lib/channel/channel_args.cc',
   'src/core/lib/channel/channel_stack.cc',
   'src/core/lib/channel/channel_stack_builder.cc',
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index 37dc9b4ba52..d4654034f2c 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -1056,7 +1056,7 @@ src/core/ext/transport/inproc/inproc_plugin.cc \
 src/core/ext/transport/inproc/inproc_transport.cc \
 src/core/ext/transport/inproc/inproc_transport.h \
 src/core/lib/README.md \
-src/core/lib/backoff/backoff.c \
+src/core/lib/backoff/backoff.cc \
 src/core/lib/backoff/backoff.h \
 src/core/lib/channel/README.md \
 src/core/lib/channel/channel_args.cc \
diff --git a/tools/run_tests/generated/sources_and_headers.json b/tools/run_tests/generated/sources_and_headers.json
index 8b11bb742e0..babdfeb6858 100644
--- a/tools/run_tests/generated/sources_and_headers.json
+++ b/tools/run_tests/generated/sources_and_headers.json
@@ -7994,7 +7994,7 @@
     "language": "c", 
     "name": "grpc_base", 
     "src": [
-      "src/core/lib/backoff/backoff.c", 
+      "src/core/lib/backoff/backoff.cc", 
       "src/core/lib/channel/channel_args.cc", 
       "src/core/lib/channel/channel_stack.cc", 
       "src/core/lib/channel/channel_stack_builder.cc",