diff --git a/ansible/roles/nexus/defaults/main.yml b/ansible/roles/nexus/defaults/main.yml
index 3776f44..92089e9 100644
--- a/ansible/roles/nexus/defaults/main.yml
+++ b/ansible/roles/nexus/defaults/main.yml
@@ -4,3 +4,5 @@
 # By dafault no additional docker images pushed to nexus at runtime
 # but all images are pre-populated either at buildtime or at install time (populate_nexus).
 runtime_images: {}
+# Default rule for tarball naming translation
+nexus3_image_tar: "{{ nexus3_image | regex_replace('(\\/|\\:)', '_') }}.tar"