diff --git a/xpcom/ds/nsICollection.idl b/xpcom/ds/nsICollection.idl
index 8556cc82ce91..d4663451abed 100644
--- a/xpcom/ds/nsICollection.idl
+++ b/xpcom/ds/nsICollection.idl
@@ -22,7 +22,7 @@
 [uuid(83b6019c-cbc4-11d2-8cca-0060b0fc14a3)]
 interface nsICollection : nsISupports {
 
-  readonly attribute unsigned int count;  // XXX wrong
+  readonly attribute unsigned long count;  // XXX wrong
 
   void AppendElement(in nsISupports element);
   void RemoveElement(in nsISupports element);
diff --git a/xpcom/idl/Makefile.in b/xpcom/idl/Makefile.in
index cd721c8d2a62..9eb2c950a4ed 100644
--- a/xpcom/idl/Makefile.in
+++ b/xpcom/idl/Makefile.in
@@ -30,6 +30,7 @@ IDLSRCS = \
 	nsIBaseStream.idl	\
 	nsIInputStream.idl	\
 	nsICollection.idl \
+	nsIEnumerator.idl \
 	$(NULL)
 
 # for testing purposes
diff --git a/xpcom/idl/nsICollection.idl b/xpcom/idl/nsICollection.idl
index 8556cc82ce91..d4663451abed 100644
--- a/xpcom/idl/nsICollection.idl
+++ b/xpcom/idl/nsICollection.idl
@@ -22,7 +22,7 @@
 [uuid(83b6019c-cbc4-11d2-8cca-0060b0fc14a3)]
 interface nsICollection : nsISupports {
 
-  readonly attribute unsigned int count;  // XXX wrong
+  readonly attribute unsigned long count;  // XXX wrong
 
   void AppendElement(in nsISupports element);
   void RemoveElement(in nsISupports element);