diff --git a/src/elem_to_json.cc b/src/elem_to_json.cc
index a7d3048c..9759bc44 100644
--- a/src/elem_to_json.cc
+++ b/src/elem_to_json.cc
@@ -29,6 +29,8 @@
 
 #include "config.h"
 
+#include <algorithm>
+
 #include "elem_to_json.hh"
 #include "yajlpp/yajlpp.hh"