diff --git a/Source/Client/Session/SessionPredicates.cpp b/Source/Client/Session/SessionPredicates.cpp
index f53223f9d..c6b8a4625 100644
--- a/Source/Client/Session/SessionPredicates.cpp
+++ b/Source/Client/Session/SessionPredicates.cpp
@@ -7,6 +7,12 @@
 #include "Contents/World/World.h"
 
 #include <cstdint>
+#include <map>
+
+using SummonHpTree = std::_Tree<std::_Tmap_traits<
+  std::int64_t, std::int64_t, std::less<std::int64_t>, std::allocator<std::pair<const std::int64_t, std::int64_t>>, false>>;
+extern template std::_Tree_find_result<std::_Tree_node<std::pair<const std::int64_t, std::int64_t>, void*>*>
+SummonHpTree::_Find_lower_bound<std::int64_t>(const std::int64_t&) const;
 
 // OFFSET: 0x00E1D6B0
 // FUNCTION: fn_23850