diff --git a/libreborn/include/libreborn/minecraft.h b/libreborn/include/libreborn/minecraft.h
index 60744c4..5391515 100644
--- a/libreborn/include/libreborn/minecraft.h
+++ b/libreborn/include/libreborn/minecraft.h
@@ -183,6 +183,8 @@ static void *TextEditScreen_updateEvents_vtable_addr = (void *) 0x10531c;
 
 // ProgressScreen
 
+#define PROGRESS_SCREEN_SIZE 0x4c
+
 typedef void *(*ProgressScreen_t)(unsigned char *obj);
 static ProgressScreen_t ProgressScreen = (ProgressScreen_t) 0x37044;
 
diff --git a/mods/src/misc/misc.cpp b/mods/src/misc/misc.cpp
index bb6c384..44e9f31 100644
--- a/mods/src/misc/misc.cpp
+++ b/mods/src/misc/misc.cpp
@@ -45,7 +45,7 @@ static int32_t Inventory_setupDefault_FillingContainer_addItem_call_injection(un
             // Bonemeal Is Already In The Creative Inventory
             continue;
         }
-        unsigned char *item_instance = (unsigned char *) ::operator new(0xc);
+        unsigned char *item_instance = (unsigned char *) ::operator new(ITEM_INSTANCE_SIZE);
         item_instance = (*ItemInstance_constructor_item_extra)(item_instance, *Item_dye_powder, 1, i);
         (*FillingContainer_addItem)(filling_container, item_instance);
     }
diff --git a/mods/src/server/server.cpp b/mods/src/server/server.cpp
index 1b8e9a4..19fd484 100644
--- a/mods/src/server/server.cpp
+++ b/mods/src/server/server.cpp
@@ -86,7 +86,7 @@ static void start_world(unsigned char *minecraft) {
     (*Minecraft_hostMultiplayer)(minecraft, port);
     INFO("Listening On: %i", port);
 
-    void *screen = ::operator new(0x4c);
+    void *screen = ::operator new(PROGRESS_SCREEN_SIZE);
     screen = (*ProgressScreen)((unsigned char *) screen);
     (*Minecraft_setScreen)(minecraft, (unsigned char *) screen);
 }