diff --git a/contrib/updates/prepare_cosmovisor.sh b/contrib/updates/prepare_cosmovisor.sh
index 5a3a1a944..b55fad1be 100644
--- a/contrib/updates/prepare_cosmovisor.sh
+++ b/contrib/updates/prepare_cosmovisor.sh
@@ -30,8 +30,7 @@ fi
 ## check if $BUILDDIR/old/terrad exists
 if [ ! -f "$BUILDDIR/old/terrad" ]; then
     mkdir -p $BUILDDIR/old
-    cp ./contrib/updates/Dockerfile.old _build/core-${OLD_VERSION:1}/Dockerfile
-    docker build --platform linux/amd64 --no-cache --build-arg source=./_build/core-${OLD_VERSION:1}/ --tag classic-terra/terraclassic.terrad-binary.old .
+    docker build --platform linux/amd64 --no-cache --build-arg source=./_build/core-${OLD_VERSION:1}/ --tag classic-terra/terraclassic.terrad-binary.old -f contrib/updates/Dockerfile.old .
     docker create --platform linux/amd64 --name old-temp classic-terra/terraclassic.terrad-binary.old:latest
     docker cp old-temp:/usr/local/bin/terrad $BUILDDIR/old/
     docker rm old-temp