diff --git a/mozilla/intl/unicharutil/util/Makefile.in b/mozilla/intl/unicharutil/util/Makefile.in
index d44554e4738..7f2dd6ef93f 100644
--- a/mozilla/intl/unicharutil/util/Makefile.in
+++ b/mozilla/intl/unicharutil/util/Makefile.in
@@ -45,6 +45,7 @@ include $(DEPTH)/config/autoconf.mk
 MODULE=unicharutil
 LIBRARY_NAME=unicharutil_s
 EXPORT_LIBRARY=1
+MOZILLA_INTERNAL_API = 1
 
 REQUIRES=xpcom \
 		string \