diff --git a/aegisub/FFmpegSource2/indexing.h b/aegisub/FFmpegSource2/indexing.h
index 36549fcb7..c007b6d85 100644
--- a/aegisub/FFmpegSource2/indexing.h
+++ b/aegisub/FFmpegSource2/indexing.h
@@ -84,6 +84,8 @@ public:
 	const char *GetTrackCodec(int Track) { return mkv_GetTrackInfo(MF, Track)->CodecID; }
 };
 
+#ifdef HAALISOURCE
+
 class FFHaaliIndexer : public FFIndexer {
 private:
 	int SourceMode;
@@ -102,4 +104,6 @@ public:
 	const char *GetTrackCodec(int Track) { if (Codec[Track]) return Codec[Track]->name; else return "Unsupported codec/Unknown codec name"; }
 };
 
+#endif // HAALISOURCE
+
 #endif