diff --git a/intl/build/Makefile.in b/intl/build/Makefile.in
index 1840c1bc3c5..a36c3b64610 100644
--- a/intl/build/Makefile.in
+++ b/intl/build/Makefile.in
@@ -88,5 +88,9 @@ EXTRA_DSO_LDOPTS += \
         $(NULL)
 endif
 
+ifeq ($(MOZ_OS2_TOOLS),VACPP)
+OS_LIBS += libuls.lib
+endif
+
 include $(topsrcdir)/config/rules.mk