diff --git a/widget/src/xpwidgets/nsBaseWidget.cpp b/widget/src/xpwidgets/nsBaseWidget.cpp
index 8658b505624..80d35f2edaf 100644
--- a/widget/src/xpwidgets/nsBaseWidget.cpp
+++ b/widget/src/xpwidgets/nsBaseWidget.cpp
@@ -79,6 +79,7 @@ nsBaseWidget::nsBaseWidget()
 , mEventListener(nsnull)
 , mMenuListener(nsnull)
 , mCursor(eCursor_standard)
+, mWindowType(eWindowType_child)
 , mBorderStyle(eBorderStyle_none)
 , mIsShiftDown(PR_FALSE)
 , mIsControlDown(PR_FALSE)