diff --git a/include/tools/json_writer.hxx b/include/tools/json_writer.hxx
index e811bb90e277..95a567ea505c 100644
--- a/include/tools/json_writer.hxx
+++ b/include/tools/json_writer.hxx
@@ -10,6 +10,7 @@
 
 #include <tools/toolsdllapi.h>
 #include <rtl/ustring.hxx>
+#include <algorithm>
 #include <memory>
 
 /** Simple JSON encoder designed specifically for LibreOfficeKit purposes.