diff --git a/tabbox/tabboxhandler.cpp b/tabbox/tabboxhandler.cpp
--- a/tabbox/tabboxhandler.cpp
+++ b/tabbox/tabboxhandler.cpp
@@ -344,6 +344,7 @@
     if (QWindow *w = window()) {
         wheelAngleDelta = 0;
         w->installEventFilter(q);
+        w->requestActivate();
     }
 #endif
 }