diff --git a/src/content/ContentLoader.cpp b/src/content/ContentLoader.cpp
index d0cd7e90..20050e58 100644
--- a/src/content/ContentLoader.cpp
+++ b/src/content/ContentLoader.cpp
@@ -233,6 +233,7 @@ void ContentLoader::loadItem(ItemDef* def, std::string name, fs::path file) {
     }
     root->str("icon", def->icon);
     root->str("placing-block", def->placingBlock);
+    root->num("stack-size", def->stackSize);
 
     // item light emission [r, g, b] where r,g,b in range [0..15]
     auto emissionarr = root->list("emission");
diff --git a/src/items/ItemDef.h b/src/items/ItemDef.h
index 5bfe4d9b..1bcb97df 100644
--- a/src/items/ItemDef.h
+++ b/src/items/ItemDef.h
@@ -22,6 +22,7 @@ class ItemDef {
 public:
     std::string const name;
 
+    itemcount_t stackSize = 64;
     bool generated = false;
     uint8_t emission[4] {0, 0, 0, 0};