diff --git a/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp b/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp
index 04828603b1d..35b1c7e371b 100644
--- a/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp
+++ b/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp
@@ -71,6 +71,7 @@ public:
     if (!parent) {
       *aParentInfo = nsnull;
       *aParentMethodCount = 0;
+      *aParentConstCount = 0;
       return NS_OK;
     }