diff --git a/fakeredis.py b/fakeredis.py
index 5954232..138e23b 100644
--- a/fakeredis.py
+++ b/fakeredis.py
@@ -1362,7 +1362,7 @@ def sismember(self, name, value):
 
     def smembers(self, name):
         "Return all members of the set ``name``"
-        return self._get_set(name)
+        return self._get_set(name).copy()
 
     @_remove_empty
     def smove(self, src, dst, value):
diff --git a/test_fakeredis.py b/test_fakeredis.py
index 8b1ae48..71fc30b 100644
--- a/test_fakeredis.py
+++ b/test_fakeredis.py
@@ -1488,11 +1488,22 @@ def test_sismember_wrong_type(self):
     def test_smembers(self):
         self.assertEqual(self.redis.smembers('foo'), set())
 
+    def test_smembers_copy(self):
+        self.redis.sadd('foo', 'member1')
+        set = self.redis.smembers('foo')
+        self.redis.sadd('foo', 'member2')
+        self.assertNotEqual(set, self.redis.smembers('foo'))
+
     def test_smembers_wrong_type(self):
         self.redis.zadd('foo', 1, 'member')
         with self.assertRaises(redis.ResponseError):
             self.redis.smembers('foo')
 
+    def test_smembers_runtime_error(self):
+        self.redis.sadd('foo', 'member1', 'member2')
+        for member in self.redis.smembers('foo'):
+            self.redis.srem('foo', member)
+
     def test_smove(self):
         self.redis.sadd('foo', 'member1')
         self.redis.sadd('foo', 'member2')