diff --git a/pym/euscan/mangling.py b/pym/euscan/mangling.py
index 9c2dba6..203eb21 100644
--- a/pym/euscan/mangling.py
+++ b/pym/euscan/mangling.py
@@ -47,6 +47,9 @@ def apply_mangling_rules(kind, rules, string):
 
 
 def mangle_version(up_pv, options):
+    # Default rule is gentoo when empty
+    if 'versionmangle' not in options or not options['versionmangle']:
+        options['versionmangle'] = ['gentoo']
     return apply_mangling_rules('versionmangle', options, up_pv)