diff --git a/tests/test_snippets.py b/tests/test_snippets.py
index 7178d9b09..f5028d67c 100644
--- a/tests/test_snippets.py
+++ b/tests/test_snippets.py
@@ -138,7 +138,7 @@ class SampleTestCase(unittest.TestCase):
 
         # cargo stuff
         profile_args = [] if RUST_DEBUG else ["--release"]
-        subprocess.check_call(["cargo", "build", "--features", *RUSTPYTHON_FEATURES, *profile_args])
+        subprocess.check_call(["cargo", "build", "--features", ",".join(RUSTPYTHON_FEATURES), *profile_args])
 
     @classmethod
     def tearDownClass(cls):