diff --git a/dex/tox.ini b/dex/tox.ini
index 58a0d30..c51e20b 100644
--- a/dex/tox.ini
+++ b/dex/tox.ini
@@ -28,10 +28,10 @@ commands =
     bash -c 'NAME=$(yq eval .name rockcraft.yaml) && \
              VERSION=$(yq eval .version rockcraft.yaml) && \
              ARCH=$(yq eval ".platforms | keys | .[0]" rockcraft.yaml) && \
-             rock="$\{NAME\}_$\{VERSION\}_$\{ARCH\}.rock" && \
+             ROCK="$\{NAME\}_$\{VERSION\}_$\{ARCH\}.rock" && \
              DOCKER_IMAGE=$NAME:$VERSION && \\
-             echo "Exporting $rock to docker as $DOCKER_IMAGE" && \
-             skopeo --insecure-policy copy oci-archive:$rock docker-daemon:$DOCKER_IMAGE'
+             echo "Exporting $ROCK to docker as $DOCKER_IMAGE" && \
+             skopeo --insecure-policy copy oci-archive:$ROCK docker-daemon:$DOCKER_IMAGE'
 
 [testenv:sanity]
 passenv = *