diff --git a/accessible/public/msaa/Makefile.in b/accessible/public/msaa/Makefile.in
index 9b50d38055d..f719fa2db99 100755
--- a/accessible/public/msaa/Makefile.in
+++ b/accessible/public/msaa/Makefile.in
@@ -19,6 +19,7 @@
 # the Initial Developer. All Rights Reserved.
 #
 # Contributor(s):
+#  Chase Phillips <cmp@mozilla.org>
 #
 # Alternatively, the contents of this file may be used under the terms of
 # either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -94,9 +95,9 @@ OS_LIBS = \
 $(MIDL_GENERATED_FILES): done_gen
 
 done_gen: ISimpleDOMNode.idl ISimpleDOMDocument.idl ISimpleDOMText.idl
-	$(MIDL) $(MIDL_FLAGS) $(srcdir)/ISimpleDOMNode.idl
-	$(MIDL) $(MIDL_FLAGS) $(srcdir)/ISimpleDOMDocument.idl
-	$(MIDL) $(MIDL_FLAGS) $(srcdir)/ISimpleDOMText.idl
+	$(MIDL) $(MIDL_FLAGS) /Oicf $(srcdir)/ISimpleDOMNode.idl
+	$(MIDL) $(MIDL_FLAGS) /Oicf $(srcdir)/ISimpleDOMDocument.idl
+	$(MIDL) $(MIDL_FLAGS) /Oicf $(srcdir)/ISimpleDOMText.idl
 	touch $@
 
 EXPORTS = \