diff --git a/audio/softsynth/mt32/Part.cpp b/audio/softsynth/mt32/Part.cpp
index 8c646b2b4909..c9bd86b54a4a 100644
--- a/audio/softsynth/mt32/Part.cpp
+++ b/audio/softsynth/mt32/Part.cpp
@@ -220,13 +220,13 @@ unsigned int Part::getAbsTimbreNum() const {
 	return (patchTemp->patch.timbreGroup * 64) + patchTemp->patch.timbreNum;
 }
 
-void RhythmPart::setProgram(unsigned int patchNum) {
 #if MT32EMU_MONITOR_MIDI > 0
+void RhythmPart::setProgram(unsigned int patchNum) {
 	synth->printDebug("%s: Attempt to set program (%d) on rhythm is invalid", name, patchNum);
+}
 #else
-	patchNum = 0; // Just to avoid unused variable warning
+void RhythmPart::setProgram(unsigned int) { }
 #endif
-}
 
 void Part::setProgram(unsigned int patchNum) {
 	setPatch(&synth->mt32ram.patches[patchNum]);