diff --git a/setup.py b/setup.py
index cd2006f71..6e6349b6b 100644
--- a/setup.py
+++ b/setup.py
@@ -596,7 +596,7 @@ def objects_to_spec(preset_name: str,
 
     def format_config_var(name: str, vardef: VariableDefinition) -> str:
         if vardef.type_name is None:
-            out = f'{name}={vardef.value}'
+            out = f'{name}={vardef.value},'
         else:
             out = f'{name}={vardef.type_name}({vardef.value}),'
         if vardef.comment is not None: