diff --git a/stubs/WebOb/webob/util.pyi b/stubs/WebOb/webob/util.pyi
index a02d71666927..ce5896a67dc6 100644
--- a/stubs/WebOb/webob/util.pyi
+++ b/stubs/WebOb/webob/util.pyi
@@ -9,3 +9,4 @@ status_reasons: dict[int, str]
 status_generic_reasons: dict[int, str]
 
 def strings_differ(string1: AnyStr, string2: AnyStr, compare_digest: Callable[[AnyStr, AnyStr], bool] = ...) -> bool: ...
+def urljoin(base: str, url: str) -> str: ...