diff --git a/ortools/sat/routes_support_graph.proto b/ortools/sat/routes_support_graph.proto
index 2ae472b9f5..262bf72cf3 100644
--- a/ortools/sat/routes_support_graph.proto
+++ b/ortools/sat/routes_support_graph.proto
@@ -15,6 +15,11 @@ syntax = "proto2";
 
 package operations_research.sat;
 
+option csharp_namespace = "Google.OrTools.Sat";
+option go_package = "github.com/google/or-tools/ortools/sat/proto/routessupportgraph";
+option java_package = "com.google.ortools.sat";
+option java_multiple_files = true;
+
 // An arc of a routes constraint, with its LP value.
 message ArcLpValue {
   optional int32 tail = 1;