diff --git a/source/util-threadpool.cpp b/source/util-threadpool.cpp
index 1028e435..afbcbf74 100644
--- a/source/util-threadpool.cpp
+++ b/source/util-threadpool.cpp
@@ -18,6 +18,7 @@
 */
 
 #include "util-threadpool.hpp"
+#include <cstddef>
 
 // Most Tasks likely wait for IO, so we can use that time for other tasks.
 #define CONCURRENCY_MULTIPLIER 2
diff --git a/source/util-threadpool.hpp b/source/util-threadpool.hpp
index bdb1ec9a..17dfd1fe 100644
--- a/source/util-threadpool.hpp
+++ b/source/util-threadpool.hpp
@@ -19,8 +19,10 @@
 
 #pragma once
 #include <atomic>
+#include <condition_variable>
 #include <functional>
 #include <list>
+#include <memory>
 #include <mutex>
 #include <thread>