diff --git a/src/main.h b/src/main.h
index dfdc0638b..c6b4d5708 100644
--- a/src/main.h
+++ b/src/main.h
@@ -27,6 +27,7 @@
 #ifndef INCLUDED_MAIN
 #define INCLUDED_MAIN
 
+#include <algorithm>
 #include <string>
 #include <vector>
 #include <map>