diff --git a/src/main/java/it/unibz/inf/isochrone/algorithm/Isochrone.java b/src/main/java/it/unibz/inf/isochrone/algorithm/Isochrone.java
index fab4c2ab02ffd5ca47624f18d1ff38c0205c4a3d..d2af9c871d02dea1e00cb1dea9f0caa84e770fec 100644
--- a/src/main/java/it/unibz/inf/isochrone/algorithm/Isochrone.java
+++ b/src/main/java/it/unibz/inf/isochrone/algorithm/Isochrone.java
@@ -181,7 +181,7 @@ public abstract class Isochrone {
 			dConnections = prepareDiscreteLinks(node, links);
 			updateNodeQueue(expandDiscreteLinks(dConnections));
 
-			output.addLinks(links.parallelStream().filter(PREDICATE_LINK_CONT));
+			output.addLinks(links.stream().filter(PREDICATE_LINK_CONT));
 			if (qIsExpiring && node.isExpired()) {
 				removeNode(nodeId);
 			}