diff --git a/nbd.c b/nbd.c
index a9f295f..7049998 100644
--- a/nbd.c
+++ b/nbd.c
@@ -393,7 +393,7 @@ int nbd_disconnect(int fd)
 	return 0;
 }
 
-int nbd_client(int fd, int csock)
+int nbd_client(int fd)
 {
 	int ret;
 	int serrno;
@@ -427,7 +427,7 @@ int nbd_disconnect(int fd)
     return -1;
 }
 
-int nbd_client(int fd, int csock)
+int nbd_client(int fd)
 {
     errno = ENOTSUP;
     return -1;
diff --git a/nbd.h b/nbd.h
index 5a1fbdf..f103c3c 100644
--- a/nbd.h
+++ b/nbd.h
@@ -55,7 +55,7 @@ int nbd_send_request(int csock, struct nbd_request *request);
 int nbd_receive_reply(int csock, struct nbd_reply *reply);
 int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
              off_t *offset, bool readonly, uint8_t *data, int data_size);
-int nbd_client(int fd, int csock);
+int nbd_client(int fd);
 int nbd_disconnect(int fd);
 
 #endif
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 4e607cf..9cc8f47 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -417,7 +417,7 @@ int main(int argc, char **argv)
 
             show_parts(device);
 
-            nbd_client(fd, sock);
+            nbd_client(fd);
             close(fd);
  out:
             kill(pid, SIGTERM);