diff --git a/codegen/core/src/main/java/software/amazon/smithy/python/codegen/generators/OperationGenerator.java b/codegen/core/src/main/java/software/amazon/smithy/python/codegen/generators/OperationGenerator.java
index c62b425b..9ada3907 100644
--- a/codegen/core/src/main/java/software/amazon/smithy/python/codegen/generators/OperationGenerator.java
+++ b/codegen/core/src/main/java/software/amazon/smithy/python/codegen/generators/OperationGenerator.java
@@ -93,7 +93,7 @@ private void writeAuthSchemes(PythonWriter writer) {
         }
 
         for (var authSchemeId : authSchemes.keySet()) {
-            writer.write("ShapeID($S)", authSchemeId);
+            writer.write("ShapeID($S),", authSchemeId);
         }
 
     }