diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index b0e47fe1eb4bb..e15abe26a0e61 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2240,7 +2240,9 @@ static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
 	}
 
 	/* drop invalid entries */
+	spin_lock(&ctx->completion_lock);
 	ctx->cq_extra--;
+	spin_unlock(&ctx->completion_lock);
 	WRITE_ONCE(ctx->rings->sq_dropped,
 		   READ_ONCE(ctx->rings->sq_dropped) + 1);
 	return NULL;