diff --git a/xen/include/xen/types.h b/xen/include/xen/types.h
index 64e75674da..449947b353 100644
--- a/xen/include/xen/types.h
+++ b/xen/include/xen/types.h
@@ -64,7 +64,6 @@ typedef __u64 __be64;
 
 typedef unsigned int __attribute__((__mode__(__pointer__))) uintptr_t;
 
-typedef bool bool_t;
 #define test_and_set_bool(b)   xchg(&(b), true)
 #define test_and_clear_bool(b) xchg(&(b), false)