diff --git a/xen/include/asm-x86/percpu.h b/xen/include/asm-x86/percpu.h
index aca6d2b490..d76206587f 100644
--- a/xen/include/asm-x86/percpu.h
+++ b/xen/include/asm-x86/percpu.h
@@ -1,7 +1,7 @@
 #ifndef __X86_PERCPU_H__
 #define __X86_PERCPU_H__
 
-#define PERCPU_SHIFT 13
+#define PERCPU_SHIFT 12
 #define PERCPU_SIZE  (1UL << PERCPU_SHIFT)
 
 /* Separate out the type, so (int[3], foo) works. */