diff --git a/scheme/gilded-rose.scm b/scheme/gilded-rose.scm
index 8a72f50e..dac984fa 100644
--- a/scheme/gilded-rose.scm
+++ b/scheme/gilded-rose.scm
@@ -25,11 +25,11 @@
                        (item-quality-set! item (+ (item-quality item) 1))
                        (if (string=? (item-name item) "Backstage passes to a TAFKAL80ETC concert")
                             (if (< (item-sell-in item) 11)
-                                (if (< (item-quality item) 50)
-                                    (item-quality-set! item (+ (item-quality item) 1))))
-                            (if (< (item-sell-in item) 6)
-                                (if (< (item-quality item) 50)
-                                    (item-quality-set! item (+ (item-quality item) 1))))))))
+                                (cond ((< (item-quality item) 50)
+                                       (item-quality-set! item (+ (item-quality item) 1))
+                                       (if (< (item-sell-in item) 6)
+                                           (if (< (item-quality item) 50)
+                                               (item-quality-set! item (+ (item-quality item) 1)))))))))))
 
             (if (not (string=? (item-name item) "Sulfuras, Hand of Ragnaros"))
                 (item-sell-in-set! item (- (item-sell-in item) 1)))