diff --git a/src/vnet/fib/fib_api.c b/src/vnet/fib/fib_api.c
index 07d6699..1b1c0d1 100644
--- a/src/vnet/fib/fib_api.c
+++ b/src/vnet/fib/fib_api.c
@@ -190,6 +190,7 @@
         break;
     case FIB_API_PATH_TYPE_DROP:
         out->frp_flags |= FIB_ROUTE_PATH_DROP;
+        out->frp_sw_if_index = ntohl(in->sw_if_index);
         break;
     case FIB_API_PATH_TYPE_LOCAL:
         out->frp_flags |= FIB_ROUTE_PATH_LOCAL;