diff --git a/scripts/appendJsonSerializeCode.txt b/scripts/appendJsonSerializeCode.txt
index a01f6814..9732ca3d 100755
--- a/scripts/appendJsonSerializeCode.txt
+++ b/scripts/appendJsonSerializeCode.txt
@@ -1,4 +1,5 @@
     // Json Serialize Code
+    #[\ReturnTypeWillChange]
     public function jsonSerialize(){
         $values = array_filter((array)get_object_vars($this),
         function ($val){
diff --git a/scripts/appendJsonSerializeSubClassCode.txt b/scripts/appendJsonSerializeSubClassCode.txt
index 1fa0379a..cc2e6ac7 100644
--- a/scripts/appendJsonSerializeSubClassCode.txt
+++ b/scripts/appendJsonSerializeSubClassCode.txt
@@ -1,4 +1,5 @@
     // Json Serialize Code
+    #[\ReturnTypeWillChange]
     public function jsonSerialize(){
         $values = array_filter((array)get_object_vars($this),
         function ($val){