diff --git a/concert/ext/cmd/tango.py b/concert/ext/cmd/tango.py
index acafde370..a7e9f2f04 100644
--- a/concert/ext/cmd/tango.py
+++ b/concert/ext/cmd/tango.py
@@ -76,16 +76,16 @@ def run(self, server: str, port: int, database: bool = False, device: [str, None
             if device is None:
                 device = f'concert/tango/{server}'
             if tango.Release.version_info < (9, 4, 1):
-                port_def = f"-ORBendPoint giop:tcp::{port}"
+                port_def = ["-ORBendPoint", f"giop:tcp::{port}"]
             else:
-                port_def = f"-port {port}"
+                port_def = ["-port", f"{port}"]
             run(
                 [server_class['class']],
-
                 args=[
                     server,
                     'name',
-                    port_def,
+                    port_def[0],
+                    port_def[1],
                     '-v4',
                     '-nodb',
                     '-dlist',