3 files changed, 9 insertions, 4 deletions
diff --git a/src/mongo/db/repl/replication_coordinator_impl_test.cpp b/src/mongo/db/repl/replication_coordinator_impl_test.cpp
index d7f37369a35..abd758040f0 100644
--- a/src/mongo/db/repl/replication_coordinator_impl_test.cpp
+++ b/src/mongo/db/repl/replication_coordinator_impl_test.cpp
@@ -2784,6 +2784,7 @@ TEST_F(ReplCoordTest, AwaitReplicationShouldResolveAsNormalDuringAReconfig) {
     WriteConcernOptions writeConcern;
     writeConcern.wTimeout = WriteConcernOptions::kNoTimeout;
     writeConcern.wNumNodes = 3;
+    writeConcern.syncMode = WriteConcernOptions::SyncMode::NONE;
 
     ReplicationAwaiter awaiter(getReplCoord(), &txn);
     awaiter.setOpTime(time);
@@ -2932,6 +2933,7 @@ TEST_F(ReplCoordTest,
     WriteConcernOptions writeConcern;
     writeConcern.wTimeout = WriteConcernOptions::kNoTimeout;
     writeConcern.wMode = WriteConcernOptions::kMajority;
+    writeConcern.syncMode = WriteConcernOptions::SyncMode::NONE;
 
     ReplicationAwaiter awaiter(getReplCoord(), &txn);
     awaiter.setOpTime(time);
@@ -2942,6 +2944,8 @@ TEST_F(ReplCoordTest,
     WriteConcernOptions writeConcern2;
     writeConcern2.wTimeout = WriteConcernOptions::kNoWaiting;
     writeConcern2.wMode = WriteConcernOptions::kMajority;
+    writeConcern.syncMode = WriteConcernOptions::SyncMode::NONE;
+
     ASSERT_EQUALS(ErrorCodes::WriteConcernFailed,
                   getReplCoord()->awaitReplication(&txn, time, writeConcern2).status);
 
diff --git a/src/mongo/db/repl/replication_coordinator_mock.cpp b/src/mongo/db/repl/replication_coordinator_mock.cpp
index 2ceb947cb8e..3ea4d8eef42 100644
--- a/src/mongo/db/repl/replication_coordinator_mock.cpp
+++ b/src/mongo/db/repl/replication_coordinator_mock.cpp
@@ -432,7 +432,11 @@ size_t ReplicationCoordinatorMock::getNumUncommittedSnapshots() {
 WriteConcernOptions ReplicationCoordinatorMock::populateUnsetWriteConcernOptionsSyncMode(
     WriteConcernOptions wc) {
     if (wc.syncMode == WriteConcernOptions::SyncMode::UNSET) {
-        wc.syncMode = WriteConcernOptions::SyncMode::JOURNAL;
+        if (wc.wMode == WriteConcernOptions::kMajority) {
+            wc.syncMode = WriteConcernOptions::SyncMode::JOURNAL;
+        } else {
+            wc.syncMode = WriteConcernOptions::SyncMode::NONE;
+        }
     }
     return wc;
 }
diff --git a/src/mongo/db/write_concern_options.h b/src/mongo/db/write_concern_options.h
index 91320b0d39a..0c187ed2887 100644
--- a/src/mongo/db/write_concern_options.h
+++ b/src/mongo/db/write_concern_options.h
@@ -51,9 +51,6 @@ public:
 
     WriteConcernOptions() {
         reset();
-        // We set syncMode to NONE to avoid having an UNSET syncMode in default WriteConcernOptions
-        // since that can cause invariants to trigger.
-        syncMode = SyncMode::NONE;
     }
 
     WriteConcernOptions(int numNodes, SyncMode sync, int timeout);