diff --git a/include/asm-um/page.h b/include/asm-um/page.h
index 3620a08..102eb3d 100644
--- a/include/asm-um/page.h
+++ b/include/asm-um/page.h
@@ -27,7 +27,7 @@
 #define clear_user_page(page, vaddr, pg)	clear_page(page)
 #define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
 
-#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64_BIT)
+#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
 
 typedef struct { unsigned long pte_low, pte_high; } pte_t;
 typedef struct { unsigned long long pmd; } pmd_t;