diff --git a/lib/commands/string.js b/lib/commands/string.js
index 1ba0890..400f9fe 100644
--- a/lib/commands/string.js
+++ b/lib/commands/string.js
@@ -202,16 +202,15 @@ exports.strlen = function(client, key){
  */
 
 (exports.setrange = function(client, key, offset, str){
-  var key = string(key)
-    , val = this.data[key]
+  var obj = this.lookup(string(key))
     , offset = +string(offset);
 
 
-  if (null == val) {
+  if (!obj) {
     // TODO: finish
-  } else if ('string' == this.keyType(key)) {
-    str.copy(val, offset);
-    client.int(val.length);
+  } else if ('string' == obj.type) {
+    str.copy(obj.val, offset);
+    client.int(obj.val.length);
   } else {
     client.typeError();
   }