diff --git a/proto/decentraland/sdk/components/ui_transform.proto b/proto/decentraland/sdk/components/ui_transform.proto
index 8fb002e5..a892d522 100644
--- a/proto/decentraland/sdk/components/ui_transform.proto
+++ b/proto/decentraland/sdk/components/ui_transform.proto
@@ -166,4 +166,6 @@ message PBUiTransform {
 
   optional ScrollPositionValue scroll_position = 55; // default position=(0,0)
   optional ShowScrollBar scroll_visible = 56; // default ShowScrollBar.SSB_BOTH
+
+  optional int32 z_index = 57; // default 0
 }