diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index e1d8e934ea..5228cd684a 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -540,8 +540,8 @@ if (is_ios || is_mac) {
 
     rtc_static_library("objc_videotoolbox") {
       sources = [
-        "objc/Framework/Classes/VideoToolbox/decoder.cc",
         "objc/Framework/Classes/VideoToolbox/decoder.h",
+        "objc/Framework/Classes/VideoToolbox/decoder.mm",
         "objc/Framework/Classes/VideoToolbox/encoder.h",
         "objc/Framework/Classes/VideoToolbox/encoder.mm",
         "objc/Framework/Classes/VideoToolbox/nalu_rewriter.cc",
diff --git a/webrtc/sdk/objc/Framework/Classes/VideoToolbox/decoder.cc b/webrtc/sdk/objc/Framework/Classes/VideoToolbox/decoder.mm
similarity index 100%
rename from webrtc/sdk/objc/Framework/Classes/VideoToolbox/decoder.cc
rename to webrtc/sdk/objc/Framework/Classes/VideoToolbox/decoder.mm