diff --git a/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h
index 89dc994bf5..1884867a8d 100644
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/pgtable.h
@@ -9,6 +9,7 @@
 #include <asm/fixmap.h>
 #include <asm/bitops.h>
 #include <linux/threads.h>
+#include <linux/sched.h>
 #include <asm/pda.h>
 #ifdef CONFIG_XEN
 #include <asm-xen/hypervisor.h>