diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 3ab3e4536b99..8593cafa6368 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -373,10 +373,10 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 			if (ipv6_tun) {
 				key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
 				key_size +=
-					sizeof(struct nfp_flower_ipv6_udp_tun);
+					sizeof(struct nfp_flower_ipv6_gre_tun);
 			} else {
 				key_size +=
-					sizeof(struct nfp_flower_ipv4_udp_tun);
+					sizeof(struct nfp_flower_ipv4_gre_tun);
 			}
 
 			if (enc_op.key) {