diff --git a/src/insert_completer.cc b/src/insert_completer.cc
index 026adcf5..ad32bf30 100644
--- a/src/insert_completer.cc
+++ b/src/insert_completer.cc
@@ -11,6 +11,8 @@
 #include "window.hh"
 #include "word_db.hh"
 
+#include <algorithm>
+
 namespace Kakoune
 {