diff --git a/src/doc/algorithm/polygon.cpp b/src/doc/algorithm/polygon.cpp
index 46ed91d0a..892e4ce9c 100644
--- a/src/doc/algorithm/polygon.cpp
+++ b/src/doc/algorithm/polygon.cpp
@@ -14,6 +14,7 @@
 
 #include "gfx/point.h"
 
+#include <algorithm>
 #include <vector>
 
 namespace doc {