diff --git a/src/include/linux/xfrm.h b/src/include/linux/xfrm.h
index 35261c9a5..82f394a3b 100644
--- a/src/include/linux/xfrm.h
+++ b/src/include/linux/xfrm.h
@@ -304,6 +304,7 @@ enum xfrm_attr_type_t {
 	XFRMA_OFFLOAD_DEV,	/* struct xfrm_state_offload */
 	XFRMA_SET_MARK,		/* __u32 */
 	XFRMA_SET_MARK_MASK,	/* __u32 */
+	XFRMA_IF_ID,		/* __u32 */
 	__XFRMA_MAX
 
 #define XFRMA_OUTPUT_MARK XFRMA_SET_MARK	/* Compatibility */