fix msvc warning

1 files changed, 1 insertions, 1 deletions

diff --git a/serialize/world-writer.cpp b/serialize/world-writer.cpp
index 3fa0bf2e..8127eacb 100644
--- a/serialize/world-writer.cpp
+++ b/serialize/world-writer.cpp
@@ -88,7 +88,7 @@ writer_state::writer_state(const world& world) : _world{&world}
 
 uint32_t writer_state::intern_string(StringView name)
 {
-    auto [kv, fresh] = string_map.try_emplace(name, string_map.size());
+    auto [kv, fresh] = string_map.try_emplace(name, (uint32_t)string_map.size());
     return kv->second;
 }