From fdd1783085eae3bb67388b6fa6691959c57eca26 Mon Sep 17 00:00:00 2001
From: Laurent Perron <lperron@google.com>
Date: Sat, 13 Nov 2021 08:48:46 +0100
Subject: [PATCH] fix

---
 ortools/constraint_solver/routing_lp_scheduling.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/ortools/constraint_solver/routing_lp_scheduling.h b/ortools/constraint_solver/routing_lp_scheduling.h
index 8586654d1e..9ad3351e11 100644
--- a/ortools/constraint_solver/routing_lp_scheduling.h
+++ b/ortools/constraint_solver/routing_lp_scheduling.h
@@ -508,11 +508,14 @@ class RoutingCPSatWrapper : public RoutingLinearSolverWrapper {
     }
   }
   void AddProductConstraint(int product_var, std::vector<int> vars) override {
-    sat::IntegerArgumentProto* const ct =
+    sat::LinearArgumentProto* const ct =
         model_.add_constraints()->mutable_int_prod();
-    ct->set_target(product_var);
+    ct->mutable_target()->add_vars(product_var);
+    ct->mutable_target()->add_coeffs(1);
     for (const int var : vars) {
-      ct->add_vars(var);
+      sat::LinearExpressionProto* expr = ct->add_exprs();
+      expr->add_vars(var);
+      expr->add_coeffs(1);
     }
   }
   void SetEnforcementLiteral(int ct, int condition) override {