diff --git a/multiurl/http.py b/multiurl/http.py
index d7ffabe..b9c760d 100644
--- a/multiurl/http.py
+++ b/multiurl/http.py
@@ -21,7 +21,7 @@
 
 from .base import DownloaderBase
 from .multipart import DecodeMultipart, PartFilter, compute_byte_ranges
-from .retry import robust
+from .retry import robust, RETRIABLE
 
 LOG = logging.getLogger(__name__)
 
diff --git a/tests/test_http.py b/tests/test_http.py
new file mode 100644
index 0000000..2f8ef50
--- /dev/null
+++ b/tests/test_http.py
@@ -0,0 +1,6 @@
+from multiurl.http import RETRIABLE
+
+
+def test_retriable_is_list_or_tuple():
+    assert isinstance(RETRIABLE, (list, tuple))
+
diff --git a/tests/test_robust.py b/tests/test_robust.py
index 6df3fd0..0bbae94 100644
--- a/tests/test_robust.py
+++ b/tests/test_robust.py
@@ -37,6 +37,10 @@ def killer():
         save.cancel()
 
 
+def test_retriable_is_list_or_tuple():
+    assert isinstance(RETRIABLE, (list, tuple))
+
+
 def test_robust():
     sleep = 5
     with timeout(len(RETRIABLE * sleep * 10)):