diff --git a/client/rpc/src/main/kotlin/net/corda/client/rpc/internal/RPCClientProxyHandler.kt b/client/rpc/src/main/kotlin/net/corda/client/rpc/internal/RPCClientProxyHandler.kt
index 2f65f21e40..4ed28a6fad 100644
--- a/client/rpc/src/main/kotlin/net/corda/client/rpc/internal/RPCClientProxyHandler.kt
+++ b/client/rpc/src/main/kotlin/net/corda/client/rpc/internal/RPCClientProxyHandler.kt
@@ -180,7 +180,7 @@ class RPCClientProxyHandler(
                 ThreadFactoryBuilder().setNameFormat("rpc-client-reaper-%d").setDaemon(true).build()
         )
         sendExecutor = Executors.newSingleThreadExecutor(
-                ThreadFactoryBuilder().setNameFormat("rpc-client-sender-%d").build()
+                ThreadFactoryBuilder().setNameFormat("rpc-client-sender-%d").setDaemon(true).build()
         )
         reaperScheduledFuture = reaperExecutor!!.scheduleAtFixedRate(
                 this::reapObservablesAndNotify,