diff --git a/treetrie.c b/treetrie.c
index 0baefec..650c1c5 100644
--- a/treetrie.c
+++ b/treetrie.c
@@ -51,8 +51,10 @@ static inline tt_hash_t hash(uint32_t tag,
 
   uint64_t x = tag;
   x ^= index * 11;
-  x ^= a * 11;
-  x ^= b * 11;
+  x *= 11;
+  x ^= a;
+  x *= 11;
+  x ^= b;
   return x - (x >> 32);
 }