diff --git a/test.conf b/test.conf
index 793a7b17..835a8358 100644
--- a/test.conf
+++ b/test.conf
@@ -1,6 +1,6 @@
 [TabPy]
 # TABPY_QUERY_OBJECT_PATH = /tmp/query_objects
- TABPY_PORT = %(PORT)
+ TABPY_PORT = $PORT
  # TABPY_STATE_PATH = <package-path>/tabpy/tabpy_server
 
 # Where static pages live