diff --git a/tests/forms_tests/templatetags/tags.py b/tests/forms_tests/templatetags/tags.py
index 060e5008da..8bde58ea6a 100644
--- a/tests/forms_tests/templatetags/tags.py
+++ b/tests/forms_tests/templatetags/tags.py
@@ -10,7 +10,7 @@ class CountRenderNode(Node):
         self.count += 1
         for v in context.flatten().values():
             try:
-                v.render()
+                str(v)
             except AttributeError:
                 pass
         return str(self.count)