diff --git a/src/java/com/google/android/mms/ContentType.java b/src/java/com/google/android/mms/ContentType.java
index 12a1343..51e52be 100644
--- a/src/java/com/google/android/mms/ContentType.java
+++ b/src/java/com/google/android/mms/ContentType.java
@@ -100,6 +100,7 @@
         sSupportedContentTypes.add(AUDIO_MID);
         sSupportedContentTypes.add(AUDIO_MIDI);
         sSupportedContentTypes.add(AUDIO_MP3);
+        sSupportedContentTypes.add(AUDIO_MP4);
         sSupportedContentTypes.add(AUDIO_MPEG3);
         sSupportedContentTypes.add(AUDIO_MPEG);
         sSupportedContentTypes.add(AUDIO_MPG);