diff --git a/packages/pyright-internal/src/analyzer/operations.ts b/packages/pyright-internal/src/analyzer/operations.ts
index fceccba4a455..d71c582b19d7 100644
--- a/packages/pyright-internal/src/analyzer/operations.ts
+++ b/packages/pyright-internal/src/analyzer/operations.ts
@@ -1198,7 +1198,7 @@ function validateContainmentOperation(
                         deprecatedInfo = returnTypeResult.magicMethodDeprecationInfo;
                     }
 
-                    return returnTypeResult?.type;
+                    return returnTypeResult?.type ?? evaluator.getBuiltInObject(errorNode, 'bool');
                 }
             );
         }