diff --git a/src/random.hpp b/src/random.hpp
index d388eff..894f458 100644
--- a/src/random.hpp
+++ b/src/random.hpp
@@ -27,7 +27,7 @@ namespace sc {
 
             template <typename T>
             static T choice(const std::vector<T>& vec) {
-                std::uniform_int_distribution<int> dist {0, vec.size() - 1};
+                std::uniform_int_distribution<int> dist {0, static_cast<int>(vec.size()) - 1};
                 return vec[dist(instance()._reng)];
             }