diff --git a/src/library/choice.cpp b/src/library/choice.cpp
index c6cb7ff49..ab75f26bb 100644
--- a/src/library/choice.cpp
+++ b/src/library/choice.cpp
@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 Author: Leonardo de Moura
 */
+#include <string>
 #include "util/sstream.h"
 #include "library/choice.h"
 #include "library/kernel_bindings.h"