Index: /trunk/src/VBox/Main/src-server/StorageControllerImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/StorageControllerImpl.cpp	(revision 61910)
+++ /trunk/src/VBox/Main/src-server/StorageControllerImpl.cpp	(revision 61911)
@@ -717,5 +717,5 @@
 
     m->bd.backup();
-    m->bd->fBootable = fBootable;
+    m->bd->fBootable = RT_BOOL(fBootable);
 }