diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index b3a36f7..c533d6c 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -35,6 +35,7 @@
 
 #include <linux/list.h>
 #include <linux/scatterlist.h>
+#include <linux/workqueue.h>
 
 struct ib_ucontext;