diff --git a/mozilla/widget/src/windows/nsButton.cpp b/mozilla/widget/src/windows/nsButton.cpp
index 1d721478b73..52b71b2c991 100644
--- a/mozilla/widget/src/windows/nsButton.cpp
+++ b/mozilla/widget/src/windows/nsButton.cpp
@@ -35,6 +35,7 @@ NS_IMPL_RELEASE(nsButton)
 //-------------------------------------------------------------------------
 nsButton::nsButton() : nsWindow() , nsIButton()
 {
+  NS_INIT_REFCNT();
 }
 
 //-------------------------------------------------------------------------