diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index d77a4632e..baecd544e 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -1659,7 +1659,7 @@ void FurnaceGUI::drawInsEdit() {
               }            
             }
             if (waveMax>0) {
-              NORMAL_MACRO(ins->std.waveMacro,ins->std.waveMacroLen,ins->std.waveMacroLoop,ins->std.waveMacroRel,0,waveMax,"wave",waveLabel,bitMode?64:160,ins->std.waveMacroOpen,bitMode,waveNames,false,NULL,0,0,((ins->type==DIV_INS_AY || ins->type==DIV_INS_AY8930)?1:0),NULL,uiColors[GUI_COLOR_MACRO_WAVE],mmlString[3],0,waveMax,NULL,false);
+              NORMAL_MACRO(ins->std.waveMacro,ins->std.waveMacroLen,ins->std.waveMacroLoop,ins->std.waveMacroRel,0,waveMax,"wave",waveLabel,(bitMode && ins->type!=DIV_INS_PET)?64:160,ins->std.waveMacroOpen,bitMode,waveNames,false,NULL,0,0,((ins->type==DIV_INS_AY || ins->type==DIV_INS_AY8930)?1:0),NULL,uiColors[GUI_COLOR_MACRO_WAVE],mmlString[3],0,waveMax,NULL,false);
             }
             if (ex1Max>0) {
               if (ins->type==DIV_INS_C64) {