diff --git a/src/engine/platform/amiga.cpp b/src/engine/platform/amiga.cpp
index 1772b313d..3dbdb1236 100644
--- a/src/engine/platform/amiga.cpp
+++ b/src/engine/platform/amiga.cpp
@@ -89,7 +89,7 @@ void DivPlatformAmiga::acquire(short** buf, size_t len) {
         chan[i].audSub-=AMIGA_DIVIDER;
         if (chan[i].audSub<0) {
           if (chan[i].useWave) {
-            writeAudDat(chan[i].ws.output[chan[i].audPos++]^0x80);
+            writeAudDat(chan[i].ws.output[(chan[i].audPos++)&255]^0x80);
             if (chan[i].audPos>=(unsigned int)(chan[i].audLen<<1)) {
               chan[i].audPos=0;
             }