diff --git a/tools/run_tests/sanity/core_banned_functions.py b/tools/run_tests/sanity/core_banned_functions.py
index afac10bf80e..6d9be2e5d4a 100755
--- a/tools/run_tests/sanity/core_banned_functions.py
+++ b/tools/run_tests/sanity/core_banned_functions.py
@@ -42,6 +42,12 @@ BANNED_EXCEPT = {
     'grpc_slice_buffer_reset_and_unref(': ['src/core/lib/slice/slice_buffer.c'],
     'grpc_slice_ref(': ['src/core/lib/slice/slice.c'],
     'grpc_slice_unref(': ['src/core/lib/slice/slice.c'],
+    'grpc_error_create(': ['src/core/lib/iomgr/error.c'],
+    'grpc_error_ref(': ['src/core/lib/iomgr/error.c'],
+    'grpc_error_unref(': ['src/core/lib/iomgr/error.c'],
+    'grpc_os_error(': ['src/core/lib/iomgr/error.c'],
+    'grpc_wsa_error(': ['src/core/lib/iomgr/error.c'],
+    'grpc_log_if_error(': ['src/core/lib/iomgr/error.c'],
 }
 
 errors = 0