diff --git a/protos/SignalService.proto b/protos/SignalService.proto
index e3a9583c5..a71bde61b 100644
--- a/protos/SignalService.proto
+++ b/protos/SignalService.proto
@@ -227,7 +227,6 @@ message AttachmentPointer {
   optional string  contentType = 2;
   optional bytes   key         = 3;
   optional uint32  size        = 4;
-  optional bytes   thumbnail   = 5;
   optional bytes   digest      = 6;
   optional string  fileName    = 7;
   optional uint32  flags       = 8;