diff --git a/drivers/md/dm-service-time.c b/drivers/md/dm-service-time.c
index cfa668f..9c6c2e4 100644
--- a/drivers/md/dm-service-time.c
+++ b/drivers/md/dm-service-time.c
@@ -11,6 +11,8 @@
 #include "dm.h"
 #include "dm-path-selector.h"
 
+#include <linux/slab.h>
+
 #define DM_MSG_PREFIX	"multipath service-time"
 #define ST_MIN_IO	1
 #define ST_MAX_RELATIVE_THROUGHPUT	100