diff --git a/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java b/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java
index c0838390ed..716af02c01 100644
--- a/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java
+++ b/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java
@@ -34,6 +34,7 @@ import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.C.ContentType;
 import com.google.android.exoplayer2.DefaultRenderersFactory;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayerFactory;
@@ -357,7 +358,7 @@ public class PlayerActivity extends Activity implements OnClickListener,
   }
 
   private MediaSource buildMediaSource(Uri uri, String overrideExtension) {
-    int type = TextUtils.isEmpty(overrideExtension) ? Util.inferContentType(uri)
+    @ContentType int type = TextUtils.isEmpty(overrideExtension) ? Util.inferContentType(uri)
         : Util.inferContentType("." + overrideExtension);
     switch (type) {
       case C.TYPE_SS: