diff --git a/stdlib/3/dbm/gnu.pyi b/stdlib/3/dbm/gnu.pyi
index 8d0b067c3..69c4ffa89 100644
--- a/stdlib/3/dbm/gnu.pyi
+++ b/stdlib/3/dbm/gnu.pyi
@@ -33,4 +33,4 @@ class _gdbm:
     __new__: None  # type: ignore
     __init__: None  # type: ignore
 
-def open(file: str, flag: str = ..., mode: int = ...) -> _gdbm: ...
+def open(__filename: str, __flags: str = ..., __mode: int = ...) -> _gdbm: ...
diff --git a/stdlib/3/dbm/ndbm.pyi b/stdlib/3/dbm/ndbm.pyi
index 75f17bd8d..db7c555be 100644
--- a/stdlib/3/dbm/ndbm.pyi
+++ b/stdlib/3/dbm/ndbm.pyi
@@ -33,4 +33,4 @@ class _dbm:
     __new__: None  # type: ignore
     __init__: None  # type: ignore
 
-def open(filename: str, flag: str = ..., mode: int = ...) -> _dbm: ...
+def open(__filename: str, __flags: str = ..., __mode: int = ...) -> _dbm: ...