diff --git a/src/kernel/type_checker.h b/src/kernel/type_checker.h
index a8859d6d9..8d9174ee4 100644
--- a/src/kernel/type_checker.h
+++ b/src/kernel/type_checker.h
@@ -7,6 +7,7 @@ Author: Leonardo de Moura
 #pragma once
 #include <memory>
 #include <utility>
+#include <algorithm>
 #include "util/name_generator.h"
 #include "util/name_set.h"
 #include "kernel/environment.h"