diff --git a/aasdk_proto/VideoFocusRequestMessage.proto b/aasdk_proto/VideoFocusRequestMessage.proto
index dc13d3b..a1c6b1e 100644
--- a/aasdk_proto/VideoFocusRequestMessage.proto
+++ b/aasdk_proto/VideoFocusRequestMessage.proto
@@ -25,7 +25,7 @@ package f1x.aasdk.proto.messages;
 
 message VideoFocusRequest
 {
-    required int32 disp_index = 1;
+    optional int32 disp_index = 1;
     required enums.VideoFocusMode.Enum focus_mode = 2;
     required enums.VideoFocusReason.Enum focus_reason = 3;
 }