diff --git a/src/util.hpp b/src/util.hpp
index 398c2945e3b0..9f5d27ffc5e4 100644
--- a/src/util.hpp
+++ b/src/util.hpp
@@ -25,6 +25,7 @@
 #include <math.h> // cmath may not provide round()
 #include <vector>
 #include <sstream>
+#include <algorithm>
 
 template<typename T>
 inline bool is_even(T num) { return num % 2 == 0; }