diff --git a/src/containers.h b/src/containers.h
index b9c85e0..7ce09a9 100644
--- a/src/containers.h
+++ b/src/containers.h
@@ -63,7 +63,6 @@ enum {
 
 struct wgdevice {
 	char name[IFNAMSIZ];
-	uint32_t ifindex;
 
 	uint32_t flags;
 
diff --git a/src/ipc.c b/src/ipc.c
index 8f86eb0..ceeb847 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -85,19 +85,6 @@ static int add_next_to_inflatable_buffer(struct inflatable_buffer *buffer)
 	return 0;
 }
 
-static void warn_unrecognized(const char *which)
-{
-	static bool once = false;
-	if (once)
-		return;
-	once = true;
-	fprintf(stderr,
-		"Warning: this program received from your %s one or more\n"
-		"attributes that it did not recognize. It is possible that\n"
-		"this version of wg(8) is older than your %s. You may\n"
-		"want to update this program.\n", which, which);
-}
-
 static FILE *userspace_interface_file(const char *interface)
 {
 	struct stat sbuf;
@@ -428,8 +415,6 @@ static int userspace_get_device(struct wgdevice **out, const char *interface)
 			peer->tx_bytes = NUM(0xffffffffffffffffULL);
 		else if (!strcmp(key, "errno"))
 			ret = -NUM(0x7fffffffU);
-		else
-			warn_unrecognized("daemon");
 	}
 	ret = -EPROTO;
 err:
@@ -701,8 +686,6 @@ static int parse_allowedip(const struct nlattr *attr, void *data)
 		if (!mnl_attr_validate(attr, MNL_TYPE_U8))
 			ctx->allowedip->cidr = mnl_attr_get_u8(attr);
 		break;
-	default:
-		warn_unrecognized("kernel");
 	}
 
 	return MNL_CB_OK;
@@ -772,8 +755,6 @@ static int parse_peer(const struct nlattr *attr, void *data)
 		break;
 	case WGPEER_A_ALLOWEDIPS:
 		return mnl_attr_parse_nested(attr, parse_allowedips, ctx);
-	default:
-		warn_unrecognized("kernel");
 	}
 
 	return MNL_CB_OK;
@@ -807,10 +788,6 @@ static int parse_device(const struct nlattr *attr, void *data)
 	struct get_device_ctx *ctx = data;
 
 	switch (mnl_attr_get_type(attr)) {
-	case WGDEVICE_A_IFINDEX:
-		if (!mnl_attr_validate(attr, MNL_TYPE_U32))
-			ctx->device->ifindex = mnl_attr_get_u32(attr);
-		break;
 	case WGDEVICE_A_IFNAME:
 		if (!mnl_attr_validate(attr, MNL_TYPE_STRING))
 			strncpy(ctx->device->name, mnl_attr_get_str(attr), sizeof(ctx->device->name) - 1);
@@ -833,8 +810,6 @@ static int parse_device(const struct nlattr *attr, void *data)
 		break;
 	case WGDEVICE_A_PEERS:
 		return mnl_attr_parse_nested(attr, parse_peers, ctx);
-	default:
-		warn_unrecognized("kernel");
 	}
 
 	return MNL_CB_OK;