diff --git a/derive.sh b/derive.sh
index 0ed02c2..7900663 100755
--- a/derive.sh
+++ b/derive.sh
@@ -12,7 +12,7 @@ STAMP=$(date +%F)
 docker build \
        --build-arg DEVUAN_IMAGE=$BASE_IMAGE \
        --tag $IMAGE:$STAMP \
-       --file $IMAGE.df .
+       --file $(basename $IMAGE).df .
 
 docker push $IMAGE:$STAMP
 docker tag  $IMAGE:$STAMP $IMAGE:jessie