diff --git a/buildimage.sh b/buildimage.sh
index 0efcaffa1a02ac7f6c15257ca6f706d957c4165b..2361efe9721c06f1ea509208d349a954f1e252e2 100755
--- a/buildimage.sh
+++ b/buildimage.sh
@@ -14,7 +14,7 @@ IMAGENAME="$5/goemaxima:$3"
 # check if the image already exists on the server
 docker pull "${IMAGENAME}"
 # build it
-if [ "$stack" = "2017121800" ]; then
+if [ "$3" = "2017121800" ]; then
 	docker build -t "${IMAGENAME}" --build-arg MAXIMA_VERSION="$2" --build-arg SBCL_VERSION="$1" --build-arg LIB_PATH="$4" --build-arg "MAX_LIB_PATH=/opt/maxima/assets/maximalocal.mac" . || exit 1
 else
 	docker build -t "${IMAGENAME}" --build-arg MAXIMA_VERSION="$2" --build-arg SBCL_VERSION="$1" --build-arg LIB_PATH="$4" . || exit 1