diff --git a/commparser.py b/commparser.py
index aa03234..f8af7fa 100644
--- a/commparser.py
+++ b/commparser.py
@@ -291,4 +291,4 @@ def _print_match(self, community, candidate, fieldvals):
                     output_fields.append(f'{field["name"]}={fieldvals[offset + fid]}')
             output_sections.append(",".join(output_fields))
 
-        return f"{asn}:{'':'.join(output_sections)}"
+        return f"{asn}:{':'.join(output_sections)}"