|| defined(PERL_HASH_FUNC_ONE_AT_A_TIME_OLD) \
|| defined(PERL_HASH_FUNC_BUZZHASH16) \
)
-#define PERL_HASH_FUNC_MURMUR3
+#ifdef U64
+#define PERL_HASH_FUNC_SIPHASH
+#else
+#define PERL_HASH_FUNC_ONE_AT_A_TIME
+#endif
#endif
#if defined(PERL_HASH_FUNC_BUZZHASH16)