diff --git a/mozilla/intl/uconv/ucvmath/Makefile.in b/mozilla/intl/uconv/ucvmath/Makefile.in
index 6656a175861..7bccc97817a 100644
--- a/mozilla/intl/uconv/ucvmath/Makefile.in
+++ b/mozilla/intl/uconv/ucvmath/Makefile.in
@@ -29,7 +29,7 @@ include $(DEPTH)/config/autoconf.mk
 MODULE		= ucvmath
 LIBRARY_NAME	= ucvmath
 IS_COMPONENT	= 1
-REQUIRES	= xpcom uconv
+REQUIRES	= xpcom string uconv
 
 CPPSRCS		= \
 		nsUnicodeToTeXCMSYt1.cpp \