diff --git a/headers/os/codec/MediaExtractor.h b/headers/os/codec/MediaExtractor.h
index e549934510..76defa5f4b 100644
--- a/headers/os/codec/MediaExtractor.h
+++ b/headers/os/codec/MediaExtractor.h
@@ -20,18 +20,7 @@ namespace media {
 
 class ChunkCache;
 struct chunk_buffer;
-
-
-struct stream_info {
-	status_t		status;
-	void*			cookie;
-	bool			hasCookie;
-	const void*		infoBuffer;
-	size_t			infoBufferSize;
-	ChunkCache*		chunkCache;
-	chunk_buffer*	lastChunk;
-	media_format	encodedFormat;
-};
+struct stream_info;
 
 
 class MediaExtractor {
diff --git a/src/kits/codec/MediaExtractor.cpp b/src/kits/codec/MediaExtractor.cpp
index 1241e76152..99023ca9fd 100644
--- a/src/kits/codec/MediaExtractor.cpp
+++ b/src/kits/codec/MediaExtractor.cpp
@@ -27,6 +27,18 @@
 static const size_t kMaxCacheBytes = 3 * 1024 * 1024;
 
 
+struct BPrivate::media::stream_info {
+	status_t		status;
+	void*			cookie;
+	bool			hasCookie;
+	const void*		infoBuffer;
+	size_t			infoBufferSize;
+	ChunkCache*		chunkCache;
+	chunk_buffer*	lastChunk;
+	media_format	encodedFormat;
+};
+
+
 class MediaExtractorChunkProvider : public ChunkProvider {
 public:
 	MediaExtractorChunkProvider(MediaExtractor* extractor, int32 stream)