diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index ae75389..5643f4a 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -32,6 +32,7 @@
  */
 
 #include <linux/log2.h>
+#include <linux/slab.h>
 
 #include <rdma/ib_cache.h>
 #include <rdma/ib_pack.h>