diff --git a/lib/hardware/coolstream/hd1/libcoolstream/playback_cs.h b/lib/hardware/coolstream/hd1/libcoolstream/playback_cs.h
index 681bc229d..c031e86d6 100644
--- a/lib/hardware/coolstream/hd1/libcoolstream/playback_cs.h
+++ b/lib/hardware/coolstream/hd1/libcoolstream/playback_cs.h
@@ -74,9 +74,7 @@ public:
 	void GetTitles(std::vector<int> &playlists, std::vector<std::string> &titles, int &current);
 	void SetTitle(int title);
 	uint64_t GetReadCount(void);
-
-	/* dummies for compatibility with libstb-hal */
-	void GetMetadata(std::vector<std::string> /*&keys*/, std::vector<std::string> /*&values*/){};
+	void GetMetadata(std::vector<std::string> &keys, std::vector<std::string> &values);
 };
 
 #endif // __PLAYBACK_CS_H_
diff --git a/lib/hardware/coolstream/hd2/libcoolstream/playback_cs.h b/lib/hardware/coolstream/hd2/libcoolstream/playback_cs.h
index 2966f903d..00719a650 100644
--- a/lib/hardware/coolstream/hd2/libcoolstream/playback_cs.h
+++ b/lib/hardware/coolstream/hd2/libcoolstream/playback_cs.h
@@ -75,9 +75,7 @@ public:
 	void GetTitles(std::vector<int> &playlists, std::vector<std::string> &titles, int &current);
 	void SetTitle(int title);
 	uint64_t GetReadCount(void);
-
-	/* dummies for compatibility with libstb-hal */
-	void GetMetadata(std::vector<std::string> /*&keys*/, std::vector<std::string> /*&values*/){};
+	void GetMetadata(std::vector<std::string> &keys, std::vector<std::string> &values);
 };
 
 #endif // __PLAYBACK_CS_H_