diff --git a/tabbox.cpp b/tabbox.cpp
index 416f140e03..f4a267f7a8 100644
--- a/tabbox.cpp
+++ b/tabbox.cpp
@@ -64,6 +64,7 @@ TabBox::TabBox( Workspace *ws )
     setFrameShadow(QFrame::Plain);
     setBackgroundRole(QPalette::Base);
     setLineWidth(2);
+    setMidLineWidth(2);
     setContentsMargins( 2, 2, 2, 2 );
 
     showMiniIcon = false;