diff --git a/config.m4 b/config.m4
index fcdeb81cdc4..1e48fb29070 100644
--- a/config.m4
+++ b/config.m4
@@ -18,7 +18,7 @@ if test "$PHP_GRPC" != "no"; then
 
   LIBS="-lpthread $LIBS"
 
-  CFLAGS="-Wall -Werror -Wno-parentheses-equality -Wno-unused-value -std=c11 -g -O2"
+  CFLAGS="-std=c11 -g -O2"
   CXXFLAGS="-std=c++11 -fno-exceptions -fno-rtti -g -O2"
   GRPC_SHARED_LIBADD="-lpthread $GRPC_SHARED_LIBADD"
   PHP_REQUIRE_CXX()
diff --git a/templates/config.m4.template b/templates/config.m4.template
index ad694511370..2618fb8e7fa 100644
--- a/templates/config.m4.template
+++ b/templates/config.m4.template
@@ -20,7 +20,7 @@
 
     LIBS="-lpthread $LIBS"
 
-    CFLAGS="-Wall -Werror -Wno-parentheses-equality -Wno-unused-value -std=c11 -g -O2"
+    CFLAGS="-std=c11 -g -O2"
     CXXFLAGS="-std=c++11 -fno-exceptions -fno-rtti -g -O2"
     GRPC_SHARED_LIBADD="-lpthread $GRPC_SHARED_LIBADD"
     PHP_REQUIRE_CXX()