diff --git a/webrtc/modules/video_coding/BUILD.gn b/webrtc/modules/video_coding/BUILD.gn
index 2d9e08d347..5312e05054 100644
--- a/webrtc/modules/video_coding/BUILD.gn
+++ b/webrtc/modules/video_coding/BUILD.gn
@@ -139,7 +139,7 @@ source_set("webrtc_h264") {
   ]
 
   if (rtc_use_h264) {
-    defines += [ "WEBRTC_THIRD_PARTY_H264" ]
+    defines += [ "WEBRTC_USE_H264" ]
     if (rtc_initialize_ffmpeg) {
       defines += [ "WEBRTC_INITIALIZE_FFMPEG" ]
     }
diff --git a/webrtc/modules/video_coding/codecs/h264/h264.cc b/webrtc/modules/video_coding/codecs/h264/h264.cc
index 6f7316b10a..9fdc4d4623 100644
--- a/webrtc/modules/video_coding/codecs/h264/h264.cc
+++ b/webrtc/modules/video_coding/codecs/h264/h264.cc
@@ -11,9 +11,9 @@
 
 #include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
 
-#if defined(WEBRTC_THIRD_PARTY_H264)
-#include "webrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h"
+#if defined(WEBRTC_USE_H264)
 #include "webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h"
+#include "webrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h"
 #endif
 #if defined(WEBRTC_IOS)
 #include "webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_decoder.h"
@@ -25,6 +25,20 @@
 
 namespace webrtc {
 
+namespace {
+
+#if defined(WEBRTC_USE_H264)
+bool g_rtc_use_h264 = true;
+#endif
+
+}  // namespace
+
+void DisableRtcUseH264() {
+#if defined(WEBRTC_USE_H264)
+  g_rtc_use_h264 = false;
+#endif
+}
+
 // We need this file to be C++ only so it will compile properly for all
 // platforms. In order to write ObjC specific implementations we use private
 // externs. This function is defined in h264.mm.
@@ -39,8 +53,8 @@ bool IsH264CodecSupported() {
     return true;
   }
 #endif
-#if defined(WEBRTC_THIRD_PARTY_H264)
-  return true;
+#if defined(WEBRTC_USE_H264)
+  return g_rtc_use_h264;
 #else
   return false;
 #endif
@@ -54,7 +68,8 @@ H264Encoder* H264Encoder::Create() {
     return new H264VideoToolboxEncoder();
   }
 #endif
-#if defined(WEBRTC_THIRD_PARTY_H264)
+#if defined(WEBRTC_USE_H264)
+  RTC_CHECK(g_rtc_use_h264);
   LOG(LS_INFO) << "Creating H264EncoderImpl.";
   return new H264EncoderImpl();
 #else
@@ -75,7 +90,8 @@ H264Decoder* H264Decoder::Create() {
     return new H264VideoToolboxDecoder();
   }
 #endif
-#if defined(WEBRTC_THIRD_PARTY_H264)
+#if defined(WEBRTC_USE_H264)
+  RTC_CHECK(g_rtc_use_h264);
   LOG(LS_INFO) << "Creating H264DecoderImpl.";
   return new H264DecoderImpl();
 #else
diff --git a/webrtc/modules/video_coding/codecs/h264/h264.gypi b/webrtc/modules/video_coding/codecs/h264/h264.gypi
index e82b0fd4cd..185c23de16 100644
--- a/webrtc/modules/video_coding/codecs/h264/h264.gypi
+++ b/webrtc/modules/video_coding/codecs/h264/h264.gypi
@@ -23,9 +23,12 @@
             'h264_objc.mm',
           ],
         }],
+        # TODO(hbos): Consider renaming this flag and the below macro to
+        # something which helps distinguish OpenH264/FFmpeg from other H264
+        # implementations.
         ['rtc_use_h264==1', {
           'defines': [
-            'WEBRTC_THIRD_PARTY_H264',
+            'WEBRTC_USE_H264',
           ],
           'conditions': [
             ['rtc_initialize_ffmpeg==1', {
diff --git a/webrtc/modules/video_coding/codecs/h264/include/h264.h b/webrtc/modules/video_coding/codecs/h264/include/h264.h
index 7f0bbf042b..2c404b2cef 100644
--- a/webrtc/modules/video_coding/codecs/h264/include/h264.h
+++ b/webrtc/modules/video_coding/codecs/h264/include/h264.h
@@ -27,6 +27,12 @@
 
 namespace webrtc {
 
+// Set to disable the H.264 encoder/decoder implementations that are provided if
+// |rtc_use_h264| build flag is true (if false, this function does nothing).
+// This function should only be called before or during WebRTC initialization
+// and is not thread-safe.
+void DisableRtcUseH264();
+
 class H264Encoder : public VideoEncoder {
  public:
   static H264Encoder* Create();