diff --git a/build/build-vax-netbsd.sh b/build/build-vax-netbsd.sh
index 3e17a19..5104a2e 100755
--- a/build/build-vax-netbsd.sh
+++ b/build/build-vax-netbsd.sh
@@ -107,8 +107,15 @@ popd
 # Package newly built compiler.
 gcc_name="gcc-${gcc_target}-${gcc_version}-${nb_actual_timestamp}"
 gcc_tarball="${workdir}/${gcc_name}.tar.xz"
-[ -z "${forced_output_filename}" ] || gcc_tarball="${forced_output_filename}"
-[ -d "${forced_output_filename}" ] || gcc_tarball="${forced_output_filename}/${gcc_tarball}"
+
+if [ -z "${forced_output_filename}" ]; then
+	gcc_tarball="${forced_output_filename}"
+elif [ -d "${forced_output_filename}" ]; then
+	gcc_tarball="${forced_output_filename}/${gcc_name}.tar.xz"
+else
+	gcc_tarball="${forced_output_filename}"
+fi
+
 gcc_destdir="${workdir}/${gcc_name}"
 gcc_destdir_sysroot="${gcc_destdir}/${gcc_target}-sysroot"
 mkdir -p "${gcc_destdir}"