diff --git a/pygmt/helpers/testing.py b/pygmt/helpers/testing.py
index fb738fba880..1d4e5ec4159 100644
--- a/pygmt/helpers/testing.py
+++ b/pygmt/helpers/testing.py
@@ -168,6 +168,7 @@ def download_test_data():
         "@fractures_06.txt",
         "@hotspots.txt",
         "@ridge.txt",
+        "@mars370d.txt",
         "@srtm_tiles.nc",  # needed for 03s and 01s relief data
         "@Table_5_11.txt",
         "@test.dat.nc",