diff --git a/reactos/drivers/base/kddll/kdcom.c b/reactos/drivers/base/kddll/kdcom.c
index 409b88e4d91..22d806c0720 100644
--- a/reactos/drivers/base/kddll/kdcom.c
+++ b/reactos/drivers/base/kddll/kdcom.c
@@ -216,6 +216,11 @@ KdpSendByte(IN BYTE Byte)
     /* Wait for the port to be ready */
     while ((READ_PORT_UCHAR(ComPortBase + COM_LSR) & LSR_TBE) == 0);
 
+    /* This is needed due to subtle timing issues */
+    READ_PORT_UCHAR(ComPortBase + COM_MSR);
+    while ((READ_PORT_UCHAR(ComPortBase + COM_LSR) & LSR_TBE) == 0);
+    READ_PORT_UCHAR(ComPortBase + COM_MSR);
+
     /* Send the byte */
     WRITE_PORT_UCHAR(ComPortBase + COM_DAT, Byte);
 }
@@ -224,6 +229,8 @@ KDP_STATUS
 NTAPI
 KdpPollByte(OUT PBYTE OutByte)
 {
+    READ_PORT_UCHAR(ComPortBase + COM_MSR); // Timing
+
     /* Check if data is available */
     if ((READ_PORT_UCHAR(ComPortBase + COM_LSR) & LSR_DR))
     {