diff --git a/mockredis/script.py b/mockredis/script.py
index c0a3d48..afc41cf 100644
--- a/mockredis/script.py
+++ b/mockredis/script.py
@@ -24,7 +24,7 @@ def __call__(self, keys=[], args=[], client=None):
             if not client.script_exists(self.sha)[0]:
                 self.sha = client.script_load(self.script)
 
-            return self._execute_lua(keys, args, client)
+            return self._execute_lua([str(key) for key in keys], [str(arg) for arg in args], client)
 
     def _execute_lua(self, keys, args, client):
         """
diff --git a/mockredis/tests/test_script.py b/mockredis/tests/test_script.py
index bb000b6..85e164d 100644
--- a/mockredis/tests/test_script.py
+++ b/mockredis/tests/test_script.py
@@ -240,6 +240,12 @@ def test_table_type(self):
         itemType = script(keys=[LIST1], args=[0, -1])
         eq_('table', itemType)
 
+    def test_string_arguments(self):
+        script_content = "return type(KEYS[1]) .. type(KEYS[2]) .. type(ARGV[1]) .. type(ARGV[2])"
+        script = self.redis.register_script(script_content)
+        item_types = script(keys=[64, 'abc'], args=[123, [34,43]])
+        eq_('string'*4, item_types)
+
     def test_script_hgetall(self):
         myhash = {"k1": "v1"}
         self.redis.hmset("myhash", myhash)