diff --git a/src/Mod/Sketcher/Gui/DrawSketchHandlerEllipse.h b/src/Mod/Sketcher/Gui/DrawSketchHandlerEllipse.h
index 5d2cac3e4e..714f17f819 100644
--- a/src/Mod/Sketcher/Gui/DrawSketchHandlerEllipse.h
+++ b/src/Mod/Sketcher/Gui/DrawSketchHandlerEllipse.h
@@ -395,7 +395,7 @@ private:
         auto lprojy = projy.Length();  // Py = b sin t
 
         if (lprojx > firstRadius) {
-            secondRadius = 0.0;
+            secondRadius = lprojy;
         }
         else {
             double t = std::acos(lprojx / firstRadius);