diff --git a/hooklib/uart.c b/hooklib/uart.c
index 7c6ecaf..93380c1 100644
--- a/hooklib/uart.c
+++ b/hooklib/uart.c
@@ -200,9 +200,6 @@ static HRESULT uart_handle_read(struct uart *uart, struct irp *irp)
     int requested = irp->read.nbytes;
 
     if (uart->readable.pos < requested && uart->readable.pos == 0) {
-        /* Avoid a tight polling loop which causes performance issues 
-           and massive memory leaks. Simulate hardware I/O latency. */
-        Sleep(1);
         return E_PENDING;
     }