diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index c140f731743b..5d33b9c08d1b 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -771,7 +771,7 @@ u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
 #  define MAX_ARCH_PFN		(1ULL<<(32-PAGE_SHIFT))
 # endif
 #else /* CONFIG_X86_32 */
-# define MAX_ARCH_PFN MAXMEM<<PAGE_SHIFT
+# define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT
 #endif
 
 /*