diff --git a/Ballance/BMapInspector/Ruleset/YYCRules.cpp b/Ballance/BMapInspector/Ruleset/YYCRules.cpp
index d00d0a6..37dc92c 100644
--- a/Ballance/BMapInspector/Ruleset/YYCRules.cpp
+++ b/Ballance/BMapInspector/Ruleset/YYCRules.cpp
@@ -7,6 +7,7 @@
 #include <vector>
 #include <set>
 #include <optional>
+#include <algorithm>
 #include <unordered_set>
 
 namespace L = LibCmo;