diff --git a/soh/soh/Enhancements/item-tables/ItemTableManager.cpp b/soh/soh/Enhancements/item-tables/ItemTableManager.cpp
index 9992a470a5..33f66137b9 100644
--- a/soh/soh/Enhancements/item-tables/ItemTableManager.cpp
+++ b/soh/soh/Enhancements/item-tables/ItemTableManager.cpp
@@ -1,4 +1,5 @@
 #include "ItemTableManager.h"
+#include "stddef.h"
 
 ItemTableManager::ItemTableManager() {
 }