diff --git a/src/library/blast/congruence_closure.cpp b/src/library/blast/congruence_closure.cpp
index d281badc2c..2d7eed1629 100644
--- a/src/library/blast/congruence_closure.cpp
+++ b/src/library/blast/congruence_closure.cpp
@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 Author: Leonardo de Moura
 */
+#include <algorithm>
 #include <vector>
 #include "library/constants.h"
 #include "library/blast/simplifier/simp_rule_set.h"