diff --git a/tests/test_thumbnail_tag.py b/tests/test_thumbnail_tag.py
index f3bdfda6..adc7fb0b 100644
--- a/tests/test_thumbnail_tag.py
+++ b/tests/test_thumbnail_tag.py
@@ -1,4 +1,5 @@
 import pytest
+import re
 from django.template import TemplateSyntaxError
 
 from . import imagegenerators  # noqa
@@ -87,3 +88,11 @@ def test_alternate_generator():
     clear_imagekit_cache()
     html = render_tag(ttag)
     assert html == '1'
+
+
+def test_srcset_arg():
+    ttag = r"""{% thumbnail '100x' img srcset="1.5 2" %}"""
+    clear_imagekit_cache()
+    html = render_tag(ttag)
+    srcset_regex = re.compile('srcset=".* 1x ,.* 1\\.5x ,.* 2.0x"')
+    assert srcset_regex.search(html) is not None