diff --git a/libc/kernel/uapi/rdma/hfi/hfi1_user.h b/libc/kernel/uapi/rdma/hfi/hfi1_user.h
index e74d837..3352907 100644
--- a/libc/kernel/uapi/rdma/hfi/hfi1_user.h
+++ b/libc/kernel/uapi/rdma/hfi/hfi1_user.h
@@ -42,6 +42,7 @@
 #define HFI1_CAP_OPFN (1UL << 16)
 #define HFI1_CAP_SDMA_HEAD_CHECK (1UL << 17)
 #define HFI1_CAP_EARLY_CREDIT_RETURN (1UL << 18)
+#define HFI1_CAP_AIP (1UL << 19)
 #define HFI1_RCVHDR_ENTSIZE_2 (1UL << 0)
 #define HFI1_RCVHDR_ENTSIZE_16 (1UL << 1)
 #define HFI1_RCVDHR_ENTSIZE_32 (1UL << 2)