diff --git a/sklearn/utils/_random.pyx b/sklearn/utils/_random.pyx
index 3589ffd2fdc4c..9b71b112aa1fb 100644
--- a/sklearn/utils/_random.pyx
+++ b/sklearn/utils/_random.pyx
@@ -78,7 +78,7 @@ cpdef _sample_without_replacement_with_tracking_selection(
 
     cdef cnp.int_t i
     cdef cnp.int_t j
-    cdef cnp.int_t[:] out = np.empty((n_samples, ), dtype=int)
+    cdef cnp.int_t[::1] out = np.empty((n_samples, ), dtype=int)
 
     rng = check_random_state(random_state)
     rng_randint = rng.randint
@@ -133,9 +133,9 @@ cpdef _sample_without_replacement_with_pool(cnp.int_t n_population,
 
     cdef cnp.int_t i
     cdef cnp.int_t j
-    cdef cnp.int_t[:] out = np.empty((n_samples, ), dtype=int)
+    cdef cnp.int_t[::1] out = np.empty((n_samples, ), dtype=int)
 
-    cdef cnp.int_t[:] pool = np.empty((n_population, ),
+    cdef cnp.int_t[::1] pool = np.empty((n_population, ),
                                                       dtype=int)
 
     rng = check_random_state(random_state)
@@ -195,7 +195,7 @@ cpdef _sample_without_replacement_with_reservoir_sampling(
 
     cdef cnp.int_t i
     cdef cnp.int_t j
-    cdef cnp.int_t[:] out = np.empty((n_samples, ), dtype=int)
+    cdef cnp.int_t[::1] out = np.empty((n_samples, ), dtype=int)
 
     rng = check_random_state(random_state)
     rng_randint = rng.randint