diff --git a/CHANGES.txt b/CHANGES.txt
index 772610ff9e..3a14287612 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -199,6 +199,7 @@
  * Add the ability to disable bulk loading of SSTables (CASSANDRA-18781)
  * Clean up obsolete functions and simplify cql_version handling in cqlsh (CASSANDRA-18787)
 Merged from 5.0:
+ * Make Commitlog flush data safely in Direct IO mode (CASSANDRA-20692)
  * Get SAI MemtableIndex refs before SSTableIndex refs at query time (CASSANDRA-20709)
  * Fix MAX_SEGMENT_SIZE < chunkSize in MmappedRegions::updateState (CASSANDRA-20636)
  * Full Java 17 support (CASSANDRA-20681)
diff --git a/src/java/org/apache/cassandra/db/commitlog/DirectIOSegment.java b/src/java/org/apache/cassandra/db/commitlog/DirectIOSegment.java
index b4819aa201..fec799ce9d 100644
--- a/src/java/org/apache/cassandra/db/commitlog/DirectIOSegment.java
+++ b/src/java/org/apache/cassandra/db/commitlog/DirectIOSegment.java
@@ -177,7 +177,12 @@ public class DirectIOSegment extends CommitLogSegment
         public DirectIOSegment build()
         {
             return new DirectIOSegment(segmentManager,
-                                       path -> FileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.READ, StandardOpenOption.CREATE, ExtendedOpenOption.DIRECT),
+                                       path -> FileChannel.open(path,
+                                                                StandardOpenOption.WRITE,
+                                                                StandardOpenOption.READ,
+                                                                StandardOpenOption.CREATE,
+                                                                StandardOpenOption.DSYNC,
+                                                                ExtendedOpenOption.DIRECT),
                                        fsBlockSize);
         }