1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/internal/memory.h b/include/ruby/internal/memory.h
index 270cc1ac8b..64e850c65e 100644
--- a/include/ruby/internal/memory.h
+++ b/include/ruby/internal/memory.h
@@ -643,7 +643,7 @@ rbimpl_size_mul_or_raise(size_t x, size_t y)
 static inline void *
 rb_alloc_tmp_buffer2(volatile VALUE *store, long count, size_t elsize)
 {
-    const size_t total_size = rbimpl_size_mul_or_raise(count, elsize);
+    const size_t total_size = rbimpl_size_mul_or_raise(RBIMPL_CAST((size_t)count), elsize);
     const size_t cnt = (total_size + sizeof(VALUE) - 1) / sizeof(VALUE);
     return rb_alloc_tmp_buffer_with_count(store, total_size, cnt);
 }