diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java
index aac1c87..aa0dd7c 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java
@@ -52,6 +52,7 @@
     public void open() throws IOException {
         txMaker = DBMaker
                 .newFileDB(dbFile)
+                .mmapFileEnableIfSupported()
                 .cacheSize(cacheSize)
                 .makeTxMaker();
     }