diff --git a/ortools/util/random_engine.h b/ortools/util/random_engine.h
index 41db5b56af..c9a45301f3 100644
--- a/ortools/util/random_engine.h
+++ b/ortools/util/random_engine.h
@@ -20,7 +20,7 @@
 
 namespace operations_research {
 
-using random_engine_t = std::mt19937;
+using random_engine_t = std::mt19937_64;
 
 }  // namespace operations_research