diff --git a/third_party/bazel/src/main/protobuf/failure_details.proto b/third_party/bazel/src/main/protobuf/failure_details.proto
index c73e8940605..7659066ddb1 100644
--- a/third_party/bazel/src/main/protobuf/failure_details.proto
+++ b/third_party/bazel/src/main/protobuf/failure_details.proto
@@ -750,6 +750,7 @@ message LocalExecution {
   enum Code {
     LOCAL_EXECUTION_UNKNOWN = 0 [(metadata) = { exit_code: 37 }];
     LOCKFREE_OUTPUT_PREREQ_UNMET = 1 [(metadata) = { exit_code: 2 }];
+    UNTRACKED_RESOURCE = 2 [(metadata) = { exit_code: 1 }];
   }
 
   Code code = 1;