diff --git a/src/ukify/ukify.py b/src/ukify/ukify.py
index 80d4bfd7e7..94fe16db27 100755
--- a/src/ukify/ukify.py
+++ b/src/ukify/ukify.py
@@ -387,7 +387,7 @@ class Section:
 
 @dataclasses.dataclass
 class UKI:
-    executable: list[Union[Path, str]]
+    executable: Path
     sections: list[Section] = dataclasses.field(default_factory=list, init=False)
 
     def add_section(self, section: Section) -> None: