1 files changed, 1 insertions, 0 deletions
diff --git a/src/mongo/db/s/config/configsvr_refine_collection_shard_key_command.cpp b/src/mongo/db/s/config/configsvr_refine_collection_shard_key_command.cpp
index a58168f06be..28bdc7869df 100644
--- a/src/mongo/db/s/config/configsvr_refine_collection_shard_key_command.cpp
+++ b/src/mongo/db/s/config/configsvr_refine_collection_shard_key_command.cpp
@@ -128,6 +128,7 @@ public:
                                       newShardKeyPattern,
                                       boost::none,
                                       collType.getUnique(),
+                                      true /* enforceUniquenessCheck */,
                                       shardkeyutil::ValidationBehaviorsRefineShardKey(opCtx, nss));
                               });