diff --git a/src/Library/GrowthRates/LookupGrowthRate.hpp b/src/Library/GrowthRates/LookupGrowthRate.hpp
index 9aa65ff..58e5a75 100644
--- a/src/Library/GrowthRates/LookupGrowthRate.hpp
+++ b/src/Library/GrowthRates/LookupGrowthRate.hpp
@@ -6,7 +6,7 @@
 namespace CreatureLib::Library {
     class LookupGrowthRate : public GrowthRate {
     protected:
-        std::vector<int32_t> _experience = {
+        std::vector<uint32_t> _experience = {
             0,      15,     52,     122,    237,    406,    637,    942,    1326,   1800,   2369,   3041,   3822,
             4719,   5737,   6881,   8155,   9564,   11111,  12800,  14632,  16610,  18737,  21012,  23437,  26012,
             28737,  31610,  34632,  37800,  41111,  44564,  48155,  51881,  55737,  59719,  63822,  68041,  72369,