diff --git a/tests/test_python/test_retrieve_data.py b/tests/test_python/test_retrieve_data.py
index e35838c0dd..1d54e0904c 100644
--- a/tests/test_python/test_retrieve_data.py
+++ b/tests/test_python/test_retrieve_data.py
@@ -168,7 +168,7 @@ def test_gdas_ics_from_aws(self):
         with tempfile.TemporaryDirectory(dir=self.path) as tmp_dir:
             os.chdir(tmp_dir)
 
-            out_path_tmpl = os.path.join(tmp_dir, "mem{{mem:03d}}")
+            out_path_tmpl = os.path.join(tmp_dir, "mem{mem:03d}")
 
             # fmt: off
             args = [