diff --git a/src/wily/operators/__init__.py b/src/wily/operators/__init__.py
index a4074a0e..3b052369 100644
--- a/src/wily/operators/__init__.py
+++ b/src/wily/operators/__init__.py
@@ -112,12 +112,12 @@ def run(self, module: str, options: Dict[str, Any]) -> Dict[Any, Any]:
 """Dictionary of all operators"""
 ALL_OPERATORS = {
     operator.name: operator
-    for operator in {
+    for operator in (
         OPERATOR_CYCLOMATIC,
         OPERATOR_MAINTAINABILITY,
         OPERATOR_RAW,
         OPERATOR_HALSTEAD,
-    }
+    )
 }