diff --git a/jstests/core/read_majority_mmap.js b/jstests/core/read_majority_mmap.js
new file mode 100644
index 00000000000..367908eea42
--- /dev/null
+++ b/jstests/core/read_majority_mmap.js
@@ -0,0 +1,12 @@
+// Ensure read majority works on a standalone node, even with non-snapshotting storage engines.
+
+(function() {
+"use strict";
+
+var name = "readMajority";
+db = db.getSiblingDB(name);
+assert.writeOK(db.foo.insert({x: 3}));
+
+assert.commandWorked(db.foo.runCommand({find: name, readConcern: {level: "majority"}}));
+
+}());
diff --git a/src/mongo/db/dbcommands.cpp b/src/mongo/db/dbcommands.cpp
index 9fcfb6032e1..2b0e7a161a4 100644
--- a/src/mongo/db/dbcommands.cpp
+++ b/src/mongo/db/dbcommands.cpp
@@ -1320,7 +1320,11 @@ bool Command::run(OperationContext* txn,
                     return false;
                 }
             }
-            if (readConcern.getLevel() == repl::ReadConcernLevel::kMajorityReadConcern) {
+
+            if ((replCoord->getReplicationMode() ==
+                     repl::ReplicationCoordinator::Mode::modeReplSet ||
+                 testingSnapshotBehaviorInIsolation) &&
+                readConcern.getLevel() == repl::ReadConcernLevel::kMajorityReadConcern) {
                 Status status = txn->recoveryUnit()->setReadFromMajorityCommittedSnapshot();
                 if (!status.isOK()) {
                     replyBuilder->setMetadata(rpc::makeEmptyMetadata()).setCommandReply(status);