diff --git a/src/UESaveFile/PropertySerialiser.cpp b/src/UESaveFile/PropertySerialiser.cpp
index 4c64756..cc69f68 100644
--- a/src/UESaveFile/PropertySerialiser.cpp
+++ b/src/UESaveFile/PropertySerialiser.cpp
@@ -134,7 +134,7 @@ auto PropertySerialiser::readSet(BinaryReader& reader, const std::string& item_t
     }
     else {
         for(UnsignedInt i = 0; i < count; i++) {
-            auto item = readItem(reader, item_type, -1, "");
+            auto item = readItem(reader, item_type, UnsignedLong(-1), "");
             arrayAppend(array, std::move(item));
         }
     }