diff --git a/libc/kernel/uapi/rdma/efa-abi.h b/libc/kernel/uapi/rdma/efa-abi.h
index 86cfac6..f20e3e0 100644
--- a/libc/kernel/uapi/rdma/efa-abi.h
+++ b/libc/kernel/uapi/rdma/efa-abi.h
@@ -91,6 +91,7 @@
 };
 enum {
   EFA_QUERY_DEVICE_CAPS_RDMA_READ = 1 << 0,
+  EFA_QUERY_DEVICE_CAPS_RNR_RETRY = 1 << 1,
 };
 struct efa_ibv_ex_query_device_resp {
   __u32 comp_mask;