diff --git a/plugins/launcher/launcher.c b/plugins/launcher/launcher.c
index 9ba3b4e..46d2dd0 100644
--- a/plugins/launcher/launcher.c
+++ b/plugins/launcher/launcher.c
@@ -1275,7 +1275,7 @@ launcher_plugin_size_changed (XfcePanelPlugin *panel_plugin,
           if (horizontal)
             p_width += ARROW_BUTTON_SIZE;
           else
-            p_height += ARROW_BUTTON_SIZE;
+            p_height -= ARROW_BUTTON_SIZE;
           break;
         }