diff --git a/src/rng.cpp b/src/rng.cpp
index be2a31d4f57d7..2fcf17b7e2791 100644
--- a/src/rng.cpp
+++ b/src/rng.cpp
@@ -191,7 +191,8 @@ double rng_normal( double lo, double hi )
 
 cata_default_random_engine::result_type rng_get_first_seed()
 {
-    static auto seed = std::chrono::high_resolution_clock::now().time_since_epoch().count();
+    using rep = std::chrono::high_resolution_clock::rep;
+    static rep seed = std::chrono::high_resolution_clock::now().time_since_epoch().count();
     return static_cast<cata_default_random_engine::result_type>( seed );
 }