diff --git a/xpcom/io/Makefile.in b/xpcom/io/Makefile.in
index fae810b50e42..a2d8a32cce3c 100644
--- a/xpcom/io/Makefile.in
+++ b/xpcom/io/Makefile.in
@@ -29,7 +29,7 @@ include $(DEPTH)/config/autoconf.mk
 MODULE		= xpcom
 XPIDL_MODULE	= xpcom_io
 LIBRARY_NAME	= xpcomio_s
-REQUIRES	= uconv string
+REQUIRES	= uconv string necko
 
 CPPSRCS		= \
 		nsDirectoryService.cpp \