diff --git a/xpcom/tests/Makefile.in b/xpcom/tests/Makefile.in
index f161092015dc..9329bde2cd65 100644
--- a/xpcom/tests/Makefile.in
+++ b/xpcom/tests/Makefile.in
@@ -127,6 +127,8 @@ ifndef MOZILLA_INTERNAL_API
 LIBS +=	$(DIST)/lib/$(LIB_PREFIX)xpcomglue_s.$(LIB_SUFFIX)
 endif
 
+LIBS += $(XPCOM_LIBS)
+
 # Needed to resolve __yylex (?)
 ifeq ($(OS_ARCH)$(OS_RELEASE),FreeBSD2)
 LIBS		+= -lpcap