diff --git a/treetrie.c b/treetrie.c
index d545a37..d9edd63 100644
--- a/treetrie.c
+++ b/treetrie.c
@@ -10,31 +10,31 @@
 
 typedef uint32_t tt_hash_t;
 
-/* /\* Customized special-purpose fasthash variation *\/ */
-/* #define mix(h) ({					\ */
-/* 			(h) ^= (h) >> 23;		\ */
-/* 			(h) *= 0x2127599bf4325c37ULL;	\ */
-/* 			(h) ^= (h) >> 47; }) */
-/* static inline uint64_t fasthash_4_ints(uint32_t v1, uint32_t v2, uint32_t v3, uint32_t v4) { */
-/*   const uint64_t    m = 0x880355f21e6d1965ULL; */
-/*   uint64_t h = (16 * m); */
-/*   uint64_t v; */
-/*   v = (((uint64_t) v2) << 32) | v1; */
-/*   h ^= mix(v); */
-/*   h *= m; */
-/*   v = (((uint64_t) v4) << 32) | v3; */
-/*   h ^= mix(v); */
-/*   h *= m; */
-/*   return mix(h); */
-/* } */
+/* Customized special-purpose fasthash variation */
+#define mix(h) ({					\
+			(h) ^= (h) >> 23;		\
+			(h) *= 0x2127599bf4325c37ULL;	\
+			(h) ^= (h) >> 47; })
+static inline uint64_t fasthash_4_ints(uint32_t v1, uint32_t v2, uint32_t v3, uint32_t v4) {
+  const uint64_t    m = 0x880355f21e6d1965ULL;
+  uint64_t h = (16 * m);
+  uint64_t v;
+  v = (((uint64_t) v2) << 32) | v1;
+  h ^= mix(v);
+  h *= m;
+  v = (((uint64_t) v4) << 32) | v3;
+  h ^= mix(v);
+  h *= m;
+  return mix(h);
+}
 
 static inline tt_hash_t hash(uint32_t tag,
 			     uint32_t index,
 			     tt_node_ptr_t a,
 			     tt_node_ptr_t b)
 {
-  /* uint64_t x = fasthash_4_ints(tag, index, a, b); */
-  /* return x - (x >> 32); */
+  uint64_t x = fasthash_4_ints(tag, index, a, b);
+  return x - (x >> 32);
 
   /* uint32_t keyblock[4] = { tag, */
   /* 			   index, */
@@ -42,19 +42,6 @@ static inline tt_hash_t hash(uint32_t tag,
   /* 			   b }; */
   /* assert(sizeof(keyblock) == 4 * sizeof(uint32_t)); */
   /* return (tt_hash_t) fasthash32(keyblock, sizeof(keyblock), 0); */
-
-  /* uint64_t x = tag; */
-  /* x = (x << 8) ^ index; */
-  /* x = (x << 8) ^ a; */
-  /* x = (x << 8) ^ b; */
-  /* return x - (x >> 32); */
-
-  uint64_t x = index * 11;
-  x *= 11;
-  x ^= a;
-  x *= 11;
-  x ^= b * tag;
-  return x - (x >> 32);
 }
 
 static inline tt_hash_t tt_hash_node(tt_arena_t *a, tt_node_ptr_t p) {