diff --git a/RoutingAlgorithms/AlternativePathRouting.h b/RoutingAlgorithms/AlternativePathRouting.h
index 14f0e3701..9ea3381f9 100644
--- a/RoutingAlgorithms/AlternativePathRouting.h
+++ b/RoutingAlgorithms/AlternativePathRouting.h
@@ -708,7 +708,7 @@ template <class DataFacadeT> class AlternativeRouting : private BasicRoutingInte
         {
             return false;
         }
-        const int T_threshold = VIAPATH_EPSILON * lengthOfShortestPath;
+        const int T_threshold = static_cast<int>(VIAPATH_EPSILON * lengthOfShortestPath);
         int unpacked_until_distance = 0;
 
         std::stack<SearchSpaceEdge> unpack_stack;