diff --git a/pandas/_libs/lib.pyi b/pandas/_libs/lib.pyi
index daaaacee3487d..ebdf78d04379b 100644
--- a/pandas/_libs/lib.pyi
+++ b/pandas/_libs/lib.pyi
@@ -161,7 +161,7 @@ def maybe_booleans_to_slice(
 ) -> slice | npt.NDArray[np.uint8]: ...
 def maybe_indices_to_slice(
     indices: npt.NDArray[np.intp],
-    max_len: int,
+    max_len: np.intp,
 ) -> slice | npt.NDArray[np.intp]: ...
 def is_all_arraylike(obj: list) -> bool: ...
 
diff --git a/pandas/_libs/lib.pyx b/pandas/_libs/lib.pyx
index 489d4fa111d40..75ab3259ccef6 100644
--- a/pandas/_libs/lib.pyx
+++ b/pandas/_libs/lib.pyx
@@ -494,7 +494,7 @@ def has_only_ints_or_nan(const floating[:] arr) -> bool:
     return True
 
 
-def maybe_indices_to_slice(ndarray[intp_t, ndim=1] indices, int max_len):
+def maybe_indices_to_slice(ndarray[intp_t, ndim=1] indices, intp_t max_len):
     cdef:
         Py_ssize_t i, n = len(indices)
         intp_t k, vstart, vlast, v