diff --git a/src/engine/platform/rf5c68.h b/src/engine/platform/rf5c68.h
index c22688c3b..2703a2900 100644
--- a/src/engine/platform/rf5c68.h
+++ b/src/engine/platform/rf5c68.h
@@ -35,6 +35,7 @@ class DivPlatformRF5C68: public DivDispatch {
       SharedChannel<int>(255),
       audPos(0),
       sample(-1),
+      wave(-1),
       panning(255),
       setPos(false),
       macroVolMul(64) {}