diff --git a/src/thread_pool.cpp b/src/thread_pool.cpp
index d53c4e83..8d3c9291 100644
--- a/src/thread_pool.cpp
+++ b/src/thread_pool.cpp
@@ -23,6 +23,7 @@
 #include <thread>
 #include <iostream>
 #include <ciso646> // fix windows compiler bug
+#include <cmath> // std::pow
 
 namespace dht {