diff --git a/pygmt/helpers/testing.py b/pygmt/helpers/testing.py
index 858ee786275..a7aabe16e89 100644
--- a/pygmt/helpers/testing.py
+++ b/pygmt/helpers/testing.py
@@ -161,6 +161,7 @@ def download_test_data():
         # Names like @N35E135.earth_relief_03s_g.nc is for internal use only.
         # The naming scheme may change. DO NOT USE IT IN YOUR SCRIPTS.
         "@N35E135.earth_relief_03s_g.nc",
+        "@N00W090.earth_relief_03m_p.nc",
         # Other cache files
         "@fractures_06.txt",
         "@ridge.txt",