diff --git a/Dockerfile b/Dockerfile
index 8ca2cef0..e3c31e92 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,4 +14,4 @@ VOLUME /factorioClusterio/instances
 VOLUME /factorioClusterio/sharedMods
 VOLUME /factorioClusterio/sharedPlugins
 
-CMD node $MODE\.js start $INSTANCE
\ No newline at end of file
+CMD node RCONPORT="$RCONPORT" FACTORIOPORT="$FACTORIOPORT" MODE="$MODE" $MODE\.js start $INSTANCE
\ No newline at end of file
diff --git a/client.js b/client.js
index 3029864e..6409aac4 100644
--- a/client.js
+++ b/client.js
@@ -175,6 +175,12 @@ write-data=__PATH__executable__/../../../instances/" + instance + "\r\n\
 	if(instancedirectory != "./instances/undefined"){
 		var instanceconfig = require(instancedirectory + '/config');
 		instanceconfig.unique = instanceconfig.clientPassword.hashCode();
+		if(process.env.FACTORIOPORT){
+			instanceconfig.factorioPort = process.env.FACTORIOPORT;
+		}
+		if(process.env.RCONPORT){
+			instanceconfig.rconPort = process.env.RCONPORT;
+		}
 	} else {
 		process.exit(1)
 	}