diff --git a/src/ui/Controls/NikseUpDown.cs b/src/ui/Controls/NikseUpDown.cs
index 91626c995..5cd472ef5 100644
--- a/src/ui/Controls/NikseUpDown.cs
+++ b/src/ui/Controls/NikseUpDown.cs
@@ -532,7 +532,7 @@ namespace Nikse.SubtitleEdit.Controls
                 _buttonLeftIsDown = false;
                 Invalidate();
             }
-            base.OnMouseDown(e);
+            base.OnMouseUp(e);
         }
 
         protected override void OnMouseMove(MouseEventArgs e)