diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index a09f4e4..9eec877 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -3424,7 +3424,7 @@ FLATTEN PRESERVE_NONE void begin(CheckJob *job, CheckContext *context) {
                                 job->readVersion, context->tls)
                      ? ConflictSet::Commit
                      : ConflictSet::Conflict;
-  return complete(job, context);
+  MUSTTAIL return complete(job, context);
 }
 
 } // namespace check_range_read_state_machine