diff --git a/OsmAnd-java/src/net/osmand/router/RoutingConfiguration.java b/OsmAnd-java/src/net/osmand/router/RoutingConfiguration.java
index 7b7d4ca14d..4098427f07 100644
--- a/OsmAnd-java/src/net/osmand/router/RoutingConfiguration.java
+++ b/OsmAnd-java/src/net/osmand/router/RoutingConfiguration.java
@@ -114,8 +114,10 @@ public class RoutingConfiguration {
 		}
 		
 		public void addImpassableRoad(RouteDataObject r) {
-			impassableRoadIds.add(r.id);
-			impassableRoads.add(r);
+			if (!impassableRoadIds.contains(r.id)){
+				impassableRoadIds.add(r.id);
+				impassableRoads.add(r);
+			}
 		}