diff --git a/src/gui/osc.cpp b/src/gui/osc.cpp
index ac4105a37..d2f62910e 100644
--- a/src/gui/osc.cpp
+++ b/src/gui/osc.cpp
@@ -58,8 +58,8 @@ void FurnaceGUI::readOsc() {
     float* sincITable=DivFilterTables::getSincIntegralTable();
 
     float posFrac=0.0;
-    int posInt=oscReadPos-8;
     float factor=(float)oscWidth/(float)winSize;
+    int posInt=oscReadPos-(8.0f/factor);
     for (int i=-8; i<oscWidth; i++) {
       if (i>=0 && i<oscWidth) {
         oscValues[ch][i]+=e->oscBuf[ch][posInt&0x7fff];