diff --git a/src/Mass/Mass.cpp b/src/Mass/Mass.cpp
index 017a957..f07bf65 100644
--- a/src/Mass/Mass.cpp
+++ b/src/Mass/Mass.cpp
@@ -1104,7 +1104,7 @@ auto Mass::writeWeaponType(const char* prop_name, Containers::ArrayView<Weapon>
         weapon_prop->at<ByteProperty>("Type_2_35ABA8C3406F8D9BBF14A89CD6BCE976")->enumValue = weapon.type;
 
         auto parts_prop = weapon_prop->at<ArrayProperty>("Element_6_8E4617CC4B2C1F1490435599784EC6E0");
-        if(parts_prop->items.size() != weapon_array.size()) {
+        if(parts_prop->items.size() != weapon.parts.size()) {
             _state = State::Invalid;
             return false;
         }