Index: /trunk/src/VBox/Frontends/VirtualBox/src/medium/UIMediumEnumerator.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/medium/UIMediumEnumerator.cpp	(revision 48273)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/medium/UIMediumEnumerator.cpp	(revision 48274)
@@ -17,4 +17,7 @@
  * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
  */
+
+/* Qt includes: */
+#include <QSet>
 
 /* GUI includes: */