diff --git a/src/common/async/context_pool.h b/src/common/async/context_pool.h
index 9c6cab7677d..0fee5dd7fca 100644
--- a/src/common/async/context_pool.h
+++ b/src/common/async/context_pool.h
@@ -46,7 +46,7 @@ class io_context_pool {
   }
 public:
   io_context_pool() noexcept {}
-  io_context_pool(std::int16_t threadcnt) noexcept {
+  io_context_pool(std::int64_t threadcnt) noexcept {
     start(threadcnt);
   }
   ~io_context_pool() {