diff --git a/src/Gui/Selection/SoFCUnifiedSelection.h b/src/Gui/Selection/SoFCUnifiedSelection.h
index 2f234b55ef..0fae0ca3d3 100644
--- a/src/Gui/Selection/SoFCUnifiedSelection.h
+++ b/src/Gui/Selection/SoFCUnifiedSelection.h
@@ -300,7 +300,7 @@ public:
     void setColorOverride(Base::Color c) {
         overrideColor = true;
         colorOverride = SbColor(c.r,c.g,c.b);
-        transOverride = c.a;
+        transOverride = 1.0 - c.a;
     }
 
     void removeColorOverride() {
@@ -477,3 +477,4 @@ private:
 } // namespace Gui
 
 #endif // !GUI_SOFCUNIFIEDSELECTION_H
+