diff --git a/src/movepick.h b/src/movepick.h
index a16fdcd2..b81f76e1 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -22,6 +22,7 @@
 #include <algorithm>
 #include <array>
 #include <cassert>
+#include <cmath>
 #include <cstdint>
 #include <cstdlib>
 #include <limits>