diff --git a/python/pyarrow/_compute.pyx b/python/pyarrow/_compute.pyx
index 607f6723da3fd..cec849a01f585 100644
--- a/python/pyarrow/_compute.pyx
+++ b/python/pyarrow/_compute.pyx
@@ -2861,9 +2861,9 @@ def register_vector_function(func, function_name, function_doc, in_types, out_ty
     >>> answer
     <pyarrow.lib.DoubleArray object at ...>
     [
-        0.3333333333333333,
-        0.6666666666666666,
-        1
+      0.3333333333333333,
+      0.6666666666666666,
+      1
     ]
     """
     return _register_user_defined_function(get_register_vector_function(),
diff --git a/python/pyarrow/tests/test_udf.py b/python/pyarrow/tests/test_udf.py
index 43e7f9d0ce3ab..62d1eb5bafd4f 100644
--- a/python/pyarrow/tests/test_udf.py
+++ b/python/pyarrow/tests/test_udf.py
@@ -841,7 +841,7 @@ def test_hash_agg_random(sum_agg_func_fixture):
 def test_vector_basic(unary_vector_func_fixture):
     arr = pa.array([10.0, 20.0, 30.0, 40.0, 50.0], pa.float64())
     result = pc.call_function("y=pct_rank(x)", [arr])
-    expected = unary_vector_func_fixture(None, arr)
+    expected = unary_vector_func_fixture[0](None, arr)
     assert result == expected
 
 
@@ -849,7 +849,7 @@ def test_vector_basic(unary_vector_func_fixture):
 def test_vector_empty(unary_vector_func_fixture):
     arr = pa.array([1], pa.float64())
     result = pc.call_function("y=pct_rank(x)", [arr])
-    expected = unary_vector_func_fixture(None, arr)
+    expected = unary_vector_func_fixture[0](None, arr)
     assert result == expected