diff --git a/Ports/libtool/package.sh b/Ports/libtool/package.sh
index 4f7c23d587..14f5d00c05 100755
--- a/Ports/libtool/package.sh
+++ b/Ports/libtool/package.sh
@@ -3,6 +3,7 @@ port=libtool
 version=2.4
 useconfigure="true"
 use_fresh_config_sub="true"
+config_sub_path=libltdl/config/config.sub
 depends=("bash" "sed")
 files="https://ftpmirror.gnu.org/gnu/libtool/libtool-${version}.tar.xz libtool-${version}.tar.xz
 https://ftpmirror.gnu.org/gnu/libtool/libtool-${version}.tar.xz.sig libtool-${version}.tar.xz.sig