diff --git a/akka-distributed-data/src/multi-jvm/scala/akka/cluster/ddata/DurableDataSpec.scala b/akka-distributed-data/src/multi-jvm/scala/akka/cluster/ddata/DurableDataSpec.scala
index bfb8fb16f8..39986c538f 100644
--- a/akka-distributed-data/src/multi-jvm/scala/akka/cluster/ddata/DurableDataSpec.scala
+++ b/akka-distributed-data/src/multi-jvm/scala/akka/cluster/ddata/DurableDataSpec.scala
@@ -32,7 +32,8 @@ final case class DurableDataSpecConfig(writeBehind: Boolean) extends MultiNodeCo
       map-size = 10 MiB
       write-behind-interval = ${if (writeBehind) "200ms" else "off"}
     }
-    akka.test.single-expect-default = 5s
+    # initialization of lmdb can be very slow in CI environment
+    akka.test.single-expect-default = 15s
     """))
 }