diff --git a/Plugins/RawRouteData.h b/Plugins/RawRouteData.h
index 18e210297..4a6f53a43 100644
--- a/Plugins/RawRouteData.h
+++ b/Plugins/RawRouteData.h
@@ -25,7 +25,7 @@ struct RawRouteData {
     std::vector< _PathData > computedRouted;
     std::vector< PhantomNodes > segmentEndCoordinates;
     std::vector< _Coordinate > rawViaNodeCoordinates;
-    int checkSum;
+    unsigned checkSum;
 };
 
 #endif /* RAWROUTEDATA_H_ */
diff --git a/Plugins/ViaRoutePlugin.h b/Plugins/ViaRoutePlugin.h
index 9f7ad8ba1..34f5b0fbc 100644
--- a/Plugins/ViaRoutePlugin.h
+++ b/Plugins/ViaRoutePlugin.h
@@ -83,9 +83,9 @@ public:
 
         RawRouteData rawRoute;
         rawRoute.checkSum = nodeHelpDesk->GetCheckSum();
-        checksumOK = (atoi(routeParameters.options.Find("checksum").c_str()) == rawRoute.checkSum);
+        checksumOK = ((unsigned)atoi(routeParameters.options.Find("checksum").c_str()) == rawRoute.checkSum);
         if(!checksumOK) {
-            INFO(atoi(routeParameters.options.Find("checksum").c_str()) << "!=" << rawRoute.checkSum);
+            INFO((unsigned)atoi(routeParameters.options.Find("checksum").c_str()) << "!=" << rawRoute.checkSum);
             INFO("mismatching checksum");
         }
         std::vector<std::string> textCoord;