diff --git a/plugins/include/datapack.inc b/plugins/include/datapack.inc
index 6e2fcd83..81b81254 100644
--- a/plugins/include/datapack.inc
+++ b/plugins/include/datapack.inc
@@ -53,7 +53,7 @@ native WritePackFloat(Handle:pack, Float:val);
  * @noreturn
  * @error			Invalid handle.
  */
-native WritePackString(Handle:pack, String:str[]);
+native WritePackString(Handle:pack, const String:str[]);
 
 /**
  * Reads a cell from a data pack.