diff --git a/src/platform/sdl/sdl-events.h b/src/platform/sdl/sdl-events.h
index 42010c7bf..05debc576 100644
--- a/src/platform/sdl/sdl-events.h
+++ b/src/platform/sdl/sdl-events.h
@@ -27,6 +27,4 @@ void GBASDLDeinitEvents(struct GBASDLEvents*);
 
 void GBASDLHandleEvent(struct GBAThread* context, struct GBASDLEvents* sdlContext, const union SDL_Event* event);
 
-enum GBAKey GBASDLMapButtonToKey(int button);
-
 #endif