diff --git a/src/engine/platform/pce.cpp b/src/engine/platform/pce.cpp
index 497d4611..130a45ec 100644
--- a/src/engine/platform/pce.cpp
+++ b/src/engine/platform/pce.cpp
@@ -297,7 +297,7 @@ int DivPlatformPCE::dispatch(DivCommand c) {
       rWrite(0x09,c.value);
       break;
     case DIV_CMD_PCE_LFO_SPEED:
-      rWrite(0x08,c.value);
+      rWrite(0x08,255-c.value);
       break;
     case DIV_CMD_NOTE_PORTA: {
       int destFreq=NOTE_PERIODIC(c.value2);