diff --git a/camino/PreferencePanes/Shared/PreferencePaneBase.mm b/camino/PreferencePanes/Shared/PreferencePaneBase.mm
index c3729df437f..46fc90dfc41 100644
--- a/camino/PreferencePanes/Shared/PreferencePaneBase.mm
+++ b/camino/PreferencePanes/Shared/PreferencePaneBase.mm
@@ -38,6 +38,7 @@
 
 #import "PreferencePaneBase.h"
 
+#include "nsCOMPtr.h"
 #include "nsIServiceManager.h"
 #include "nsIPref.h"