1 files changed, 2 insertions, 2 deletions

diff --git a/liblali.c b/liblali.c
index cfd4d76..831cc66 100644
--- a/liblali.c
+++ b/liblali.c
@@ -855,13 +855,13 @@ Object *primitiveDiff(Object **args, GC_PARAM) {
       (first->type == TYPE_SYMBOL && second->type == TYPE_SYMBOL))
     return strcmp(first->string, second->string) ? t : f;
   else if (first->type == TYPE_CONS && second->type == TYPE_CONS) {
-	 for (; (first->cdr != nil || second->cdr != nil);
+	 for (; (first->cdr->type == TYPE_CONS && second->cdr->type == TYPE_CONS);
 			first = first->cdr, second = second->cdr) {
 		if (strcmp(first->string, second->string))
 		  return t;
 	 }
 	 return (strcmp(first->car->string, second->car->string) ||
-				(first->cdr != nil && second->cdr != nil)) ? t : f;
+				strcmp(first->cdr->string, second->cdr->string)) ? t : f;
   }
   else
     return t;