diff --git a/stdlib/2and3/parser.pyi b/stdlib/2and3/parser.pyi
index 85c19ecc4..d6ed07ba8 100644
--- a/stdlib/2and3/parser.pyi
+++ b/stdlib/2and3/parser.pyi
@@ -22,7 +22,7 @@ def issuite(st: STType) -> bool: ...
 class ParserError(Exception): ...
 
 class STType:
-    def compile(self, filename: _Path) -> CodeType: ...
+    def compile(self, filename: _Path = ...) -> CodeType: ...
     def isexpr(self) -> bool: ...
     def issuite(self) -> bool: ...
     def tolist(self, line_info: bool = ..., col_info: bool = ...) -> List[Any]: ...