diff --git a/rtgui/mydiagonalcurve.cc b/rtgui/mydiagonalcurve.cc
index bf146b03d..2e908bf83 100644
--- a/rtgui/mydiagonalcurve.cc
+++ b/rtgui/mydiagonalcurve.cc
@@ -1065,6 +1065,10 @@ void MyDiagonalCurve::pipetteMouseOver (CurveEditor *ce, EditDataProvider *provi
 // returns true if a point is being dragged
 bool MyDiagonalCurve::pipetteButton1Pressed(EditDataProvider *provider, int modifierKey)
 {
+    if (!(modifierKey & GDK_CONTROL_MASK)) {
+        return false;
+    }
+    
     if (edited_point > 1) {
         return false;
     }
diff --git a/rtgui/myflatcurve.cc b/rtgui/myflatcurve.cc
index 210fb42f2..e71f09567 100644
--- a/rtgui/myflatcurve.cc
+++ b/rtgui/myflatcurve.cc
@@ -1278,6 +1278,10 @@ void MyFlatCurve::pipetteMouseOver (CurveEditor *ce, EditDataProvider *provider,
 // returns true if a point is being dragged
 bool MyFlatCurve::pipetteButton1Pressed(EditDataProvider *provider, int modifierKey)
 {
+    if (!(modifierKey & GDK_CONTROL_MASK)) {
+        return false;
+    }
+    
     if (edited_point > -1) {
         return false;
     }