diff --git a/src/pyproject_hooks/__init__.py b/src/pyproject_hooks/__init__.py
index 99f11d6..eba2275 100644
--- a/src/pyproject_hooks/__init__.py
+++ b/src/pyproject_hooks/__init__.py
@@ -23,4 +23,6 @@
 ]
 
 if TYPE_CHECKING:
-    from ._impl import SubprocessRunner  # noqa: F401
+    from ._impl import SubprocessRunner
+
+    __all__ += ["SubprocessRunner"]