diff --git a/webrtc/modules/utility/include/file_player.h b/webrtc/modules/utility/include/file_player.h
index 5f79fd28e2..508c2110a6 100644
--- a/webrtc/modules/utility/include/file_player.h
+++ b/webrtc/modules/utility/include/file_player.h
@@ -57,16 +57,16 @@ class FilePlayer {
                                    uint32_t startPosition,
                                    float volumeScaling,
                                    uint32_t notification,
-                                   uint32_t stopPosition = 0,
-                                   const CodecInst* codecInst = NULL) = 0;
+                                   uint32_t stopPosition,
+                                   const CodecInst* codecInst) = 0;
 
   // Note: codecInst is used for pre-encoded files.
   virtual int32_t StartPlayingFile(InStream& sourceStream,
                                    uint32_t startPosition,
                                    float volumeScaling,
                                    uint32_t notification,
-                                   uint32_t stopPosition = 0,
-                                   const CodecInst* codecInst = NULL) = 0;
+                                   uint32_t stopPosition,
+                                   const CodecInst* codecInst) = 0;
 
   virtual int32_t StopPlayingFile() = 0;
 
diff --git a/webrtc/modules/utility/source/file_player.cc b/webrtc/modules/utility/source/file_player.cc
index c6429b8b0d..4b33929ef0 100644
--- a/webrtc/modules/utility/source/file_player.cc
+++ b/webrtc/modules/utility/source/file_player.cc
@@ -38,14 +38,14 @@ class FilePlayerImpl : public FilePlayer {
                                    uint32_t startPosition,
                                    float volumeScaling,
                                    uint32_t notification,
-                                   uint32_t stopPosition = 0,
-                                   const CodecInst* codecInst = NULL);
+                                   uint32_t stopPosition,
+                                   const CodecInst* codecInst);
   virtual int32_t StartPlayingFile(InStream& sourceStream,
                                    uint32_t startPosition,
                                    float volumeScaling,
                                    uint32_t notification,
-                                   uint32_t stopPosition = 0,
-                                   const CodecInst* codecInst = NULL);
+                                   uint32_t stopPosition,
+                                   const CodecInst* codecInst);
   virtual int32_t StopPlayingFile();
   virtual bool IsPlayingFile() const;
   virtual int32_t GetPlayoutPosition(uint32_t& durationMs);