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-rw-r--r--cl-math.lisp2
1 files changed, 1 insertions, 1 deletions
diff --git a/cl-math.lisp b/cl-math.lisp
index 9efa61f..61a8e26 100644
--- a/cl-math.lisp
+++ b/cl-math.lisp
@@ -61,7 +61,7 @@
   "Given a list of a numeral system and two lists of numbers, it returns the list of it's sum."
   (cond
     ((and
-      (eql (length b-reversed) 1)
+      (null (cdr b-reversed))
       (eql (car b-reversed) (if (zerop (car numerals))
 				(cadr numerals)
 				(car numerals))))
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