diff --git a/src/internal/mana_arena.h b/src/internal/mana_arena.h
index 097d3f5..fe3972d 100644
--- a/src/internal/mana_arena.h
+++ b/src/internal/mana_arena.h
@@ -1,6 +1,7 @@
 #ifndef F20CF38F_7327_4608_8307_6AE058041CD5
 #define F20CF38F_7327_4608_8307_6AE058041CD5
 
+#include <algorithm>
 #include <cstring>
 #include <list>
 #include <mesytec-mnode/mnode_math.h>