diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index ea31a30a4..7ea6fa083 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -470,7 +470,7 @@ void FurnaceGUI::drawFMEnv(unsigned char tl, unsigned char ar, unsigned char dr,
     ImVec2 pos3=ImLerp(rect.Min,rect.Max,ImVec2(drPos,(float)((tl/127.0)+(sl/15.0)-((tl/127.0)*(sl/15.0))))); //end of DR, start of D2R
     ImVec2 pos4=ImLerp(rect.Min,rect.Max,ImVec2(d2rPos,1.0)); //end of D2R
 
-    ImVec2 posSLineHEnd=ImLerp(rect.Min,rect.Max,ImVec2(1.0,(float)((tl/127.0)+(sl/15.0)-((tl/127.0)*(sl/15.0))))); //sustain vert. line end
+    ImVec2 posSLineHEnd=ImLerp(rect.Min,rect.Max,ImVec2(0.0,(float)((tl/127.0)+(sl/15.0)-((tl/127.0)*(sl/15.0))))); //sustain vert. line end
     ImVec2 posSLineVEnd=ImLerp(rect.Min,rect.Max,ImVec2(drPos,1.0)); //sustain horiz. line end
     ImVec2 posRStart=ImLerp(rect.Min,rect.Max,ImVec2(0.0,0.0+(tl/127.0))); //release start
     ImVec2 posREnd=ImLerp(rect.Min,rect.Max,ImVec2(rrPos,1.0));//release end