diff --git a/xpcom/typelib/xpt/tests/Makefile.in b/xpcom/typelib/xpt/tests/Makefile.in
index 40c5223324a0..52f4fac1f9b9 100644
--- a/xpcom/typelib/xpt/tests/Makefile.in
+++ b/xpcom/typelib/xpt/tests/Makefile.in
@@ -30,6 +30,7 @@ CSRCS		= PrimitiveTest.c SimpleTypeLib.c
 LIBS		= 		\
 		  -L$(DIST)/bin \
 		  -lxpcom 	\
+		  $(NSPR_LIBS)	\
 		  $(NULL)
 
 include $(topsrcdir)/config/rules.mk