diff --git a/src/proto/inst.proto b/src/proto/inst.proto
index 5ef266455f..d561661f16 100644
--- a/src/proto/inst.proto
+++ b/src/proto/inst.proto
@@ -52,7 +52,10 @@ message InstHeader {
 
 message Inst {
   required uint64 pc = 1;
-  required fixed32 inst = 2;
+  oneof inst_oneof {
+    fixed32 inst = 2;
+    bytes inst_bytes = 9;
+  }
   optional uint32 nodeid = 3;
   optional uint32 cpuid = 4;
   optional fixed64 tick = 5;