diff --git a/src/attr/_cmp.pyi b/src/attr/_cmp.pyi
index 35437eff6..f3dcdc1a7 100644
--- a/src/attr/_cmp.pyi
+++ b/src/attr/_cmp.pyi
@@ -3,11 +3,11 @@ from typing import Any, Callable, Optional, Type
 _CompareWithType = Callable[[Any, Any], bool]
 
 def cmp_using(
-    eq: Optional[_CompareWithType],
-    lt: Optional[_CompareWithType],
-    le: Optional[_CompareWithType],
-    gt: Optional[_CompareWithType],
-    ge: Optional[_CompareWithType],
-    require_same_type: bool,
-    class_name: str,
+    eq: Optional[_CompareWithType] = ...,
+    lt: Optional[_CompareWithType] = ...,
+    le: Optional[_CompareWithType] = ...,
+    gt: Optional[_CompareWithType] = ...,
+    ge: Optional[_CompareWithType] = ...,
+    require_same_type: bool = ...,
+    class_name: str = ...,
 ) -> Type: ...