diff --git a/stdlib/_frozen_importlib_external.pyi b/stdlib/_frozen_importlib_external.pyi
index 463b4087f6b6..edad50a8d858 100644
--- a/stdlib/_frozen_importlib_external.pyi
+++ b/stdlib/_frozen_importlib_external.pyi
@@ -121,6 +121,13 @@ class FileLoader:
 class SourceFileLoader(importlib.abc.FileLoader, FileLoader, importlib.abc.SourceLoader, SourceLoader):  # type: ignore[misc]  # incompatible method arguments in base classes
     def set_data(self, path: str, data: ReadableBuffer, *, _mode: int = 0o666) -> None: ...
     def path_stats(self, path: str) -> Mapping[str, Any]: ...
+    def source_to_code(  # type: ignore[override]  # incompatible with InspectLoader.source_to_code
+        self,
+        data: ReadableBuffer | str | _ast.Module | _ast.Expression | _ast.Interactive,
+        path: ReadableBuffer | StrPath,
+        *,
+        _optimize: int = -1,
+    ) -> types.CodeType: ...
 
 class SourcelessFileLoader(importlib.abc.FileLoader, FileLoader, _LoaderBasics):
     def get_code(self, fullname: str) -> types.CodeType | None: ...