diff --git a/bench/bench-mlib.c b/bench/bench-mlib.c
index cac33807..e3f54619 100644
--- a/bench/bench-mlib.c
+++ b/bench/bench-mlib.c
@@ -139,10 +139,7 @@ static void char_init (char_array_t a) { a[0] = 0; }
 static void char_set (char_array_t a, const char_array_t b) { strcpy(a, b); }
 static bool char_equal_p (const char_array_t a, const char_array_t b) { return strcmp(a,b)==0; }
 static size_t char_hash(const char_array_t a) {
-  M_HASH_DECL(hash);
-  const char *s = a;
-  while (*s) M_HASH_UP(hash, *s++);
-  return hash;
+  return m_core_hash (a, strlen(a));
 }
 // NOTE: Can't set OPLIST as a macro!
 #define CHAR_OPLIST (INIT(char_init), INIT_SET(char_set), SET(char_set), CLEAR(char_init), HASH(char_hash), EQUAL(char_equal_p))