diff --git a/base.py b/base.py
index e0341ce..43fdae1 100644
--- a/base.py
+++ b/base.py
@@ -132,6 +132,7 @@ class ServiceManager:
             value = section.get(key)
             if key.endswith('_PORT'):
                 return value.replace('nr', nr)
+            value = value.replace('<INS>', ins)
             return ':'.join(expanduser(p % dict(ins=ins)) for p in value.split(':'))
 
         for ins in parser.sections():