diff --git a/django/core/cache/backends/dummy.py b/django/core/cache/backends/dummy.py
index 3913746c495..450d0997a6a 100644
--- a/django/core/cache/backends/dummy.py
+++ b/django/core/cache/backends/dummy.py
@@ -22,6 +22,7 @@ class DummyCache(BaseCache):
         self.validate_key(key)
 
     def touch(self, key, timeout=DEFAULT_TIMEOUT, version=None):
+        key = self.make_key(key, version=version)
         self.validate_key(key)
         return False