Index: /trunk/src/VBox/Frontends/VirtualBox/src/settings/machine/UIMachineSettingsUSB.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/settings/machine/UIMachineSettingsUSB.cpp	(revision 33911)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/settings/machine/UIMachineSettingsUSB.cpp	(revision 33912)
@@ -93,5 +93,11 @@
     toolBar->setSizePolicy (QSizePolicy::Fixed, QSizePolicy::MinimumExpanding);
     toolBar->updateGeometry();
-    toolBar->setMinimumHeight (toolBar->sizeHint().height());
+#ifdef Q_WS_MAC
+    /* On the Mac this has to be slightly higher, than what sizeHint returned.
+     * No idea why. */
+    toolBar->setMinimumHeight(toolBar->sizeHint().height() + 4);
+#else
+    toolBar->setMinimumHeight(toolBar->sizeHint().height());
+#endif /* Q_WS_MAC */
     mWtFilterHandler->layout()->addWidget (toolBar);