diff --git a/libsignal/service/src/main/proto/SignalService.proto b/libsignal/service/src/main/proto/SignalService.proto
index 192bc408b..e4baee4fa 100644
--- a/libsignal/service/src/main/proto/SignalService.proto
+++ b/libsignal/service/src/main/proto/SignalService.proto
@@ -512,7 +512,8 @@ message AttachmentPointer {
   enum Flags {
     VOICE_MESSAGE = 1;
     BORDERLESS    = 2;
-    GIF           = 3;
+    reserved        3;
+    GIF           = 4;
   }
 
   oneof attachment_identifier {