diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index f8b09a82f62e..1820b87b8b7f 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -236,8 +236,8 @@ int __vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
 int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
 			size_t len, int flags);
 
-#ifdef CONFIG_BPF_SYSCALL
 extern struct proto vsock_proto;
+#ifdef CONFIG_BPF_SYSCALL
 int vsock_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
 void __init vsock_bpf_build_proto(void);
 #else