--- w_store_sales.h.orig	2014-06-25 10:58:19.000000000 -0700
+++ w_store_sales.h	2014-06-25 10:58:51.000000000 -0700
@@ -34,7 +34,7 @@
  * Gradient Systems
  */ 
 #ifndef W_STORE_SALES_H
-#define W_STORE_SLAES_H
+#define W_STORE_SALES_H
 
 #include "constants.h"
 #include "pricing.h"