diff --git a/scumm/imuse.cpp b/scumm/imuse.cpp
index 61e29fe5b79..eef988db3c8 100644
--- a/scumm/imuse.cpp
+++ b/scumm/imuse.cpp
@@ -197,6 +197,7 @@ MidiDriver *IMuseInternal::getBestMidiDriver(int sound) {
 	} else {
 		driver = _midi_adlib;
 	}
+	assert(driver);
 	return driver;
 }