diff --git a/mockredis/client.py b/mockredis/client.py
index 926e048..31e53ad 100644
--- a/mockredis/client.py
+++ b/mockredis/client.py
@@ -1060,6 +1060,13 @@ def srandmember(self, name, number=None):
         else:
             return [choice(list(redis_set)) for _ in xrange(abs(number))]
 
+    def randomkey(self):
+        """Emulate randomkey."""
+        keys = self.redis.keys()
+        if not keys:
+            return None
+        return choice(list(keys))
+
     def srem(self, key, *values):
         """Emulate srem."""
         redis_set = self._get_set(key, 'SREM')
diff --git a/mockredis/tests/test_redis.py b/mockredis/tests/test_redis.py
index 2dd1b8a..90da5d8 100644
--- a/mockredis/tests/test_redis.py
+++ b/mockredis/tests/test_redis.py
@@ -252,3 +252,8 @@ def test_dbsize(self):
         eq_(1, self.redis.dbsize())
         del self.redis["foo"]
         eq_(0, self.redis.dbsize())
+
+    def test_randomkey(self):
+        eq_(None, self.redis.randomkey())
+        self.redis["foo"] = "bar"
+        eq_(b"foo", self.redis.randomkey())