diff --git a/runtime.c b/runtime.c
index f01e6c56..75ccca58 100644
--- a/runtime.c
+++ b/runtime.c
@@ -540,9 +540,7 @@ object Cyc_has_cycle(object lst)
       return boolean_f;
     if (Cyc_is_pair(cdr(fast_lst)) == boolean_f)
       return boolean_f;
-    if (is_object_type(car(slow_lst)) && boolean_f == Cyc_is_boolean(car(slow_lst)) &&  // Avoid expected dupes
-        //boolean_f == Cyc_is_symbol(car(slow_lst)) &&  // 
-        (car(slow_lst) == car(fast_lst)))
+    if (slow_lst == fast_lst)
       return boolean_t;
 
     slow_lst = cdr(slow_lst);