1 files changed, 1 insertions, 0 deletions
diff --git a/simon/simon.h b/simon/simon.h
index 305831eb91..e7c7e6a9f0 100644
--- a/simon/simon.h
+++ b/simon/simon.h
@@ -96,6 +96,7 @@ struct VgaTimerEntry {
 struct GameSpecificSettings;
 
 class SimonState : public Engine {
+	void errorString(const char *buf_input, char *buf_output);
 public:
 	File *_mus_file;
 	uint16 *_mus_offsets;