diff --git a/js/src/xpconnect/src/Makefile.in b/js/src/xpconnect/src/Makefile.in
index 4664017e12cb..aa9f51c84912 100644
--- a/js/src/xpconnect/src/Makefile.in
+++ b/js/src/xpconnect/src/Makefile.in
@@ -42,7 +42,7 @@ include $(DEPTH)/config/autoconf.mk
 MODULE		= xpconnect
 LIBRARY_NAME	= xpconnect
 SHORT_LIBNAME	= xpconect
-REQUIRES	= xpcom js dom widget layout
+REQUIRES	= xpcom js dom widget layout caps
 
 CPPSRCS		= \
 		nsXPConnect.cpp \