diff --git a/tools/Makefile.am b/tools/Makefile.am
index 07ea5bcc7..bdfa08ca3 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -20,6 +20,7 @@ subst = sed	-e "s!@PACKAGE\@!$(PACKAGE)!g" \
 		-e "s!@exec_prefix\@!$(exec_prefix)!g" \
 		-e "s!@libdir\@!$(libdir)!g" \
 		-e "s!@includedir\@!$(includedir)!g" \
+		-e "s!@PTHREAD_LIBADD\@!$(PTHREAD_LIBADD)!g" \
 		-e "s!@LIB_crypt\@!$(LIB_crypt)!g" \
 		-e "s!@LIB_dbopen\@!$(LIB_dbopen)!g" \
 		-e "s!@INCLUDE_hcrypto\@!$(INCLUDE_hcrypto)!g" \