diff --git a/configure.in b/configure.in
index cbe0b122..00e81a8d 100644
--- a/configure.in
+++ b/configure.in
@@ -115,6 +115,7 @@ AC_ARG_WITH(perl-lib,
 		want_perl=no
 	elif test "x$withval" = xsite; then
 		want_perl=yes
+		PERL_MM_PARAMS=""
 	elif test "x$withval" = xvendor; then
 		want_perl=yes
 		if test -z "`$perlpath -v|grep '5\.0'`"; then