diff --git a/pygmt/tests/test_clib_put_strings.py b/pygmt/tests/test_clib_put_strings.py
index 0db47ca4a8a..41f0dc921d4 100644
--- a/pygmt/tests/test_clib_put_strings.py
+++ b/pygmt/tests/test_clib_put_strings.py
@@ -23,7 +23,7 @@
         pytest.param(np.array, {"dtype": str}, id="str"),
         pytest.param(
             getattr(pa, "array", None),
-            {"type": pa.string()},
+            {"type": "string"},  # pa.string()
             marks=skip_if_no(package="pyarrow"),
             id="pyarrow",
         ),
diff --git a/pygmt/tests/test_clib_virtualfiles.py b/pygmt/tests/test_clib_virtualfiles.py
index 2d9b66b47d6..f0160d8bb82 100644
--- a/pygmt/tests/test_clib_virtualfiles.py
+++ b/pygmt/tests/test_clib_virtualfiles.py
@@ -238,7 +238,7 @@ def test_virtualfile_from_vectors(dtypes):
         pytest.param(np.array, {"dtype": object}, id="object"),
         pytest.param(
             getattr(pa, "array", None),
-            {"type": pa.string()},
+            {"type": "string"},  # pa.string()
             marks=skip_if_no(package="pyarrow"),
             id="pyarrow",
         ),