diff --git a/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter.scala b/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter.scala
index 27bc4fd6f..461404e92 100644
--- a/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter.scala
+++ b/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter.scala
@@ -86,7 +86,7 @@ class RdtRouter(ws: WSEroutingClient, monitoringClient: MonitoringClientInterfac
     println(s"received sender-request for bundle: ${packet.bp}")
 
     // we only route rdt packets rn
-    if !tempRdtMetaInfoStore.contains(packet.bp.id) then {
+    if !tempRdtMetaInfoStore.containsKey(packet.bp.id) then {
       println(s"bundle meta information for bundle-id ${packet.bp.id} are not available. not routing rn.")
       return Option(Packet.ResponseSenderForBundle(bp = packet.bp, clas = List(), delete_afterwards = false))
     }
diff --git a/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter2.scala b/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter2.scala
index bcac0a214..8b1ebc0e7 100644
--- a/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter2.scala
+++ b/Modules/DTN/shared/src/main/scala/dtn/routing/RdtRouter2.scala
@@ -58,7 +58,7 @@ class RdtRouter2(ws: WSEroutingClient, monitoringClient: MonitoringClientInterfa
     println(s"received sender-request for bundle: ${packet.bp}")
 
     // we only route rdt packets rn
-    if !tempRdtMetaInfoStore.contains(packet.bp.id) then {
+    if !tempRdtMetaInfoStore.containsKey(packet.bp.id) then {
       println(s"no bundle meta information available for bundle-id ${packet.bp.id}. not routing.")
       return Option(Packet.ResponseSenderForBundle(bp = packet.bp, clas = List(), delete_afterwards = false))
     }