diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index 65e482c..9087d71 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -9,6 +9,7 @@
  * (at your option) any later version.
  */
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <asm/atomic.h>
 
 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)