diff --git a/xpcom/base/nsISupportsUtils.h b/xpcom/base/nsISupportsUtils.h
index 88561a207c5..47d3ec46add 100644
--- a/xpcom/base/nsISupportsUtils.h
+++ b/xpcom/base/nsISupportsUtils.h
@@ -267,7 +267,7 @@ NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
     foundInterface = 0;                                                  \
   nsresult status;                                                       \
   if ( !foundInterface )                                                 \
-    status = _baseclass::QueryInterface(aIID, aInstancePtr);             \
+    status = _baseclass::QueryInterface(aIID, &foundInterface);           \
   else                                                                   \
     {                                                                    \
       NS_ADDREF(foundInterface);                                         \
diff --git a/xpcom/glue/nsISupportsUtils.h b/xpcom/glue/nsISupportsUtils.h
index 88561a207c5..47d3ec46add 100644
--- a/xpcom/glue/nsISupportsUtils.h
+++ b/xpcom/glue/nsISupportsUtils.h
@@ -267,7 +267,7 @@ NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
     foundInterface = 0;                                                  \
   nsresult status;                                                       \
   if ( !foundInterface )                                                 \
-    status = _baseclass::QueryInterface(aIID, aInstancePtr);             \
+    status = _baseclass::QueryInterface(aIID, &foundInterface);           \
   else                                                                   \
     {                                                                    \
       NS_ADDREF(foundInterface);                                         \