diff --git a/src/codeobject.h b/src/codeobject.h
index a5175a9b..a754cf05 100644
--- a/src/codeobject.h
+++ b/src/codeobject.h
@@ -66,7 +66,7 @@ struct CodeObject {
     std::map<StrName, int> labels;
 
     uint32_t perfect_locals_capacity = 2;
-    uint32_t perfect_hash_seed = -1;
+    uint32_t perfect_hash_seed = 0;
 
     void optimize(VM* vm);
 
diff --git a/src/namedict.h b/src/namedict.h
index e8236278..29c64f0b 100644
--- a/src/namedict.h
+++ b/src/namedict.h
@@ -5,7 +5,7 @@
 #include "str.h"
 
 namespace pkpy{
-    const std::vector<uint32_t> kHashSeeds = {0xffffffff, 3259656564, 3106121857, 2774518055, 4085946151, 4274771677, 4047908201, 2149081045, 4160441109, 4127125901, 3109730425, 2794687362, 2806137727, 2642447290, 4070996945, 3580743775, 3719956858, 2960278187, 3568486238, 3125361093, 2232173865, 4043238260, 3265527710, 2206062780, 3968387223, 3144295694, 3293736932, 3196583945, 3832534010, 3311528523, 4258510773, 4049882022, 3058077580, 2446794117, 2330081744, 2563269634, 3848248775, 2197398712, 2874906918, 3012473024, 3477039876, 2710692860, 2806508231, 3893239503, 3929140074, 3145323261, 3593960112, 2451662716, 2545939029, 2475647797, 2790321726, 4166873680, 3504262692, 3140715282, 3078827310, 3177714229, 3006241931, 3777800785, 3621627818, 3163832382, 2166076714, 3622591406, 3299007679, 2915427082, 3939911590, 4145015468, 2791077264, 3916399405, 3330576709, 2466029172, 3534773842, 2690327419, 2487859383, 3687001303, 2615131117, 3057598651, 2548471802, 3145782646, 3895406770, 2150621965, 2179753887, 2159855306, 2439700132, 2397760304, 3405860607, 4268549710, 2779408554, 2485874456, 3796299954, 4179315997, 2380599704, 3210079474, 3951990603, 3342489194, 2997361581, 3576131817, 3163713423, 2467495451, 4190562029, 2588496185};
+    const std::vector<uint32_t> kHashSeeds = {0, 3259656564, 3106121857, 2774518055, 4085946151, 4274771677, 4047908201, 2149081045, 4160441109, 4127125901, 3109730425, 2794687362, 2806137727, 2642447290, 4070996945, 3580743775, 3719956858, 2960278187, 3568486238, 3125361093, 2232173865, 4043238260, 3265527710, 2206062780, 3968387223, 3144295694, 3293736932, 3196583945, 3832534010, 3311528523, 4258510773, 4049882022, 3058077580, 2446794117, 2330081744, 2563269634, 3848248775, 2197398712, 2874906918, 3012473024, 3477039876, 2710692860, 2806508231, 3893239503, 3929140074, 3145323261, 3593960112, 2451662716, 2545939029, 2475647797, 2790321726, 4166873680, 3504262692, 3140715282, 3078827310, 3177714229, 3006241931, 3777800785, 3621627818, 3163832382, 2166076714, 3622591406, 3299007679, 2915427082, 3939911590, 4145015468, 2791077264, 3916399405, 3330576709, 2466029172, 3534773842, 2690327419, 2487859383, 3687001303, 2615131117, 3057598651, 2548471802, 3145782646, 3895406770, 2150621965, 2179753887, 2159855306, 2439700132, 2397760304, 3405860607, 4268549710, 2779408554, 2485874456, 3796299954, 4179315997, 2380599704, 3210079474, 3951990603, 3342489194, 2997361581, 3576131817, 3163713423, 2467495451, 4190562029, 2588496185};
     const std::vector<uint32_t> kPrimes = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599};
 
     uint32_t find_next_prime(uint32_t n){
@@ -20,7 +20,7 @@ namespace pkpy{
     }
 
     uint32_t find_perfect_hash_seed(uint32_t capacity, const std::vector<StrName>& keys){
-        if(keys.empty()) return -1;
+        if(keys.empty()) return 0;
         std::set<uint32_t> indices;
         std::vector<std::pair<uint32_t, float>> scores;
         for(int i=0; i<kHashSeeds.size(); i++){
@@ -49,7 +49,7 @@ namespace pkpy{
         uint32_t _hash_seed;
         NameDictNode* _a;
 
-        NameDict(uint32_t capacity=2, float load_factor=0.67, uint32_t hash_seed=-1):
+        NameDict(uint32_t capacity=2, float load_factor=0.67, uint32_t hash_seed=0):
             _capacity(capacity), _size(0), _load_factor(load_factor),
             _hash_seed(hash_seed), _a(new NameDictNode[capacity]) {}