diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index 56d06cf129..40368597b2 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -154,18 +154,14 @@ config("common_config") {
   }
 
   if (is_android && !is_clang) {
+    # The Android NDK doesn"t provide optimized versions of these
+    # functions. Ensure they are disabled for all compilers.
     cflags += [
-      # The Android NDK doesn't provide optimized versions of these
-      # functions. Ensure they are disabled for all compilers.
       "-fno-builtin-cos",
       "-fno-builtin-sin",
       "-fno-builtin-cosf",
       "-fno-builtin-sinf",
     ]
-    cflags_c = [
-      # Use C99 mode instead of C89 (default).
-      "-std=c99",
-    ]
   }
 }
 
diff --git a/webrtc/build/common.gypi b/webrtc/build/common.gypi
index be1451d643..5caa6cc10c 100644
--- a/webrtc/build/common.gypi
+++ b/webrtc/build/common.gypi
@@ -373,18 +373,14 @@
          ],
          'conditions': [
            ['clang==0', {
+             # The Android NDK doesn't provide optimized versions of these
+             # functions. Ensure they are disabled for all compilers.
              'cflags': [
-               # The Android NDK doesn't provide optimized versions of these
-               # functions. Ensure they are disabled for all compilers.
                '-fno-builtin-cos',
                '-fno-builtin-sin',
                '-fno-builtin-cosf',
                '-fno-builtin-sinf',
              ],
-             'cflags_c': [
-               # Use C99 mode instead of C89 (default).
-               '-std=c99',
-             ]
            }],
          ],
       }],