diff --git a/include/asm-x86_64/spinlock.h b/include/asm-x86_64/spinlock.h
index be7a9e629fb262ebecef04fe3bd454752816c7ae..3daf5b0059054994c04ba2bce41a8dfa81f701fc 100644
--- a/include/asm-x86_64/spinlock.h
+++ b/include/asm-x86_64/spinlock.h
@@ -4,6 +4,7 @@
 #include <asm/atomic.h>
 #include <asm/rwlock.h>
 #include <asm/page.h>
+#include <asm/processor.h>
 
 /*
  * Your basic SMP spinlocks, allowing only a single CPU anywhere