diff --git a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaServerSideAdInsertionMediaSource.java b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaServerSideAdInsertionMediaSource.java
index 467dd58c35..9a94c53edf 100644
--- a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaServerSideAdInsertionMediaSource.java
+++ b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaServerSideAdInsertionMediaSource.java
@@ -152,7 +152,7 @@ public final class ImaServerSideAdInsertionMediaSource extends CompositeMediaSou
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return contentMediaSourceFactory.getSupportedTypes();
     }
 
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/DefaultMediaSourceFactory.java b/library/core/src/main/java/com/google/android/exoplayer2/source/DefaultMediaSourceFactory.java
index b7e04482cc..275f98db7a 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/DefaultMediaSourceFactory.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/DefaultMediaSourceFactory.java
@@ -395,7 +395,7 @@ public final class DefaultMediaSourceFactory implements MediaSourceFactory {
   }
 
   @Override
-  public int[] getSupportedTypes() {
+  public @C.ContentType int[] getSupportedTypes() {
     return delegateFactoryLoader.getSupportedTypes();
   }
 
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java
index f8cf9fae5c..07aa3309c0 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java
@@ -225,7 +225,7 @@ public final class ProgressiveMediaSource extends BaseMediaSource
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_OTHER};
     }
   }
diff --git a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java
index 1675dde09a..853f76b4a4 100644
--- a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java
+++ b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java
@@ -311,7 +311,7 @@ public final class DashMediaSource extends BaseMediaSource {
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_DASH};
     }
   }
diff --git a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
index 9d1a9f7a2f..830b9fefd3 100644
--- a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
+++ b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
@@ -359,7 +359,7 @@ public final class HlsMediaSource extends BaseMediaSource
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_HLS};
     }
   }
diff --git a/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMediaSource.java b/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMediaSource.java
index 5011eb4fcd..747bb36daa 100644
--- a/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMediaSource.java
+++ b/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMediaSource.java
@@ -164,7 +164,7 @@ public final class RtspMediaSource extends BaseMediaSource {
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_RTSP};
     }
 
diff --git a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java
index f2035c3a12..eebab34190 100644
--- a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java
+++ b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java
@@ -290,7 +290,7 @@ public final class SsMediaSource extends BaseMediaSource
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_SS};
     }
   }
diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeMediaSourceFactory.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeMediaSourceFactory.java
index 047a4d7cab..bdf6717808 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeMediaSourceFactory.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeMediaSourceFactory.java
@@ -47,7 +47,7 @@ public final class FakeMediaSourceFactory implements MediaSourceFactory {
   }
 
   @Override
-  public int[] getSupportedTypes() {
+  public @C.ContentType int[] getSupportedTypes() {
     return new int[] {C.CONTENT_TYPE_OTHER};
   }