diff --git a/Documentation/netlink/specs/fou.yaml b/Documentation/netlink/specs/fou.yaml
index 57735726262e..8e7974ec453f 100644
--- a/Documentation/netlink/specs/fou.yaml
+++ b/Documentation/netlink/specs/fou.yaml
@@ -52,7 +52,7 @@ attribute-sets:
         name: local-v6
         type: binary
         checks:
-          min-len: 16
+          exact-len: 16
       -
         name: peer-v4
         type: u32
@@ -60,7 +60,7 @@ attribute-sets:
         name: peer-v6
         type: binary
         checks:
-          min-len: 16
+          exact-len: 16
       -
         name: peer-port
         type: u16
diff --git a/net/ipv4/fou_nl.c b/net/ipv4/fou_nl.c
index 3d9614609b2d..506260b4a4dc 100644
--- a/net/ipv4/fou_nl.c
+++ b/net/ipv4/fou_nl.c
@@ -18,9 +18,9 @@ const struct nla_policy fou_nl_policy[FOU_ATTR_IFINDEX + 1] = {
 	[FOU_ATTR_TYPE] = { .type = NLA_U8, },
 	[FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, },
 	[FOU_ATTR_LOCAL_V4] = { .type = NLA_U32, },
-	[FOU_ATTR_LOCAL_V6] = { .len = 16, },
+	[FOU_ATTR_LOCAL_V6] = NLA_POLICY_EXACT_LEN(16),
 	[FOU_ATTR_PEER_V4] = { .type = NLA_U32, },
-	[FOU_ATTR_PEER_V6] = { .len = 16, },
+	[FOU_ATTR_PEER_V6] = NLA_POLICY_EXACT_LEN(16),
 	[FOU_ATTR_PEER_PORT] = { .type = NLA_BE16, },
 	[FOU_ATTR_IFINDEX] = { .type = NLA_S32, },
 };