diff --git a/engines/queen/midiadlib.cpp b/engines/queen/midiadlib.cpp
index c3bc6d1c179..b03c90f6539 100644
--- a/engines/queen/midiadlib.cpp
+++ b/engines/queen/midiadlib.cpp
@@ -30,8 +30,6 @@
 
 namespace Queen {
 
-class AdLibMidiChannel;
-
 class AdLibMidiDriver : public MidiDriver_Emulated {
 public: