diff --git a/internal/scripts/docker/Dockerfile b/internal/scripts/docker/Dockerfile
index c5daf58492..d2acbed3f6 100644
--- a/internal/scripts/docker/Dockerfile
+++ b/internal/scripts/docker/Dockerfile
@@ -19,7 +19,7 @@ RUN if [ "x${SOURCE_BRANCH}" = "x" ]; then \
       echo "Build Argument SOURCE_BRANCH=${SOURCE_BRANCH}"; \
     fi
 
-ENV MET_GIT_NAME    ${SOURCE_BRANCH}
+ENV MET_GIT_NAME    $(echo ${SOURCE_BRANCH} | sed 's%/%_%g')
 ENV MET_REPO_DIR    /met/MET-${MET_GIT_NAME}
 ENV MET_GIT_URL     https://github.com/dtcenter/MET
 ENV MET_DEVELOPMENT true
diff --git a/internal/scripts/docker/Dockerfile.copy b/internal/scripts/docker/Dockerfile.copy
index 4d3d9476cd..59941a5f03 100644
--- a/internal/scripts/docker/Dockerfile.copy
+++ b/internal/scripts/docker/Dockerfile.copy
@@ -19,7 +19,7 @@ RUN if [ "x${SOURCE_BRANCH}" = "x" ]; then \
       echo "Build Argument SOURCE_BRANCH=${SOURCE_BRANCH}"; \
     fi
 
-ENV MET_GIT_NAME    ${SOURCE_BRANCH}
+ENV MET_GIT_NAME    $(echo ${SOURCE_BRANCH} | sed 's%/%_%g')
 ENV MET_REPO_DIR    /met/MET-${MET_GIT_NAME}
 ENV MET_GIT_URL     https://github.com/dtcenter/MET
 ENV MET_DEVELOPMENT true