diff --git a/Dockerfile b/Dockerfile
index e6367cd..4f025b5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,7 +29,7 @@ ARG OPENGNSYS_BRANCH=main
 
 ## take stuff from the OG repo: a) cloning engine, b) shared stuff and c) gitrelease
 RUN git clone -c http.sslVerify=false --branch ${OPENGNSYS_BRANCH} https://ognproject.evlt.uma.es/gitea/opengnsys/opengnsys.git /tmp/ogrepo && \
-    git --git-dir /tmp/ogrepo/.git rev-parse ${OPENGNSYS_BRANCH} && \
+    git --git-dir /tmp/ogrepo/.git rev-parse HEAD && \
     mv /tmp/ogrepo/client/engine /tmp/ogrepo/client/shared /tmp/opengnsys/ && \
     git --git-dir /tmp/ogrepo/.git log --date format:r%Y%m%d --format=%ad -1 >/tmp/opengnsys/oglive_builder/gitrelease && \
     rm -rf /tmp/ogrepo/