diff --git a/cocos/platform/CCApplication.h b/cocos/platform/CCApplication.h
index 1b41707..bafeed4 100644
--- a/cocos/platform/CCApplication.h
+++ b/cocos/platform/CCApplication.h
@@ -116,20 +116,16 @@ public:
   inline char* getKeyBackup() {return key_backup;}
   inline char* getKeySeed() {return key_seed;}
   void setKeyMaster(const char *val) {
-    key_master = (char*)malloc(strlen(val) + 1);
-    strcpy(key_master, val);
+    key_master = strdup(val);
   }
   void setKeySecond(const char *val) {
-    key_second = (char*)malloc(strlen(val) + 1);
-    strcpy(key_second, val);
+    key_second = strdup(val);
   }
   void setKeyBackup(const char *val) {
-    key_backup = (char*)malloc(strlen(val) + 1);
-    strcpy(key_backup, val);
+    key_backup = strdup(val);
   }
   void setKeySeed(const char *val) {
-    key_seed = (char*)malloc(strlen(val) + 1);
-    strcpy(key_seed, val);
+    key_seed = strdup(val);
   }