diff --git a/reactos/boot/freeldr/freeldr/comm/rs232.c b/reactos/boot/freeldr/freeldr/comm/rs232.c
index 7f0d9d837a6..f589a13275d 100644
--- a/reactos/boot/freeldr/freeldr/comm/rs232.c
+++ b/reactos/boot/freeldr/freeldr/comm/rs232.c
@@ -109,7 +109,7 @@ BOOLEAN Rs232PortPollByte(PUCHAR ByteReceived)
     if (PortInitialized == FALSE)
         return FALSE;
 
-    return (CpGetByte(&Rs232ComPort, ByteReceived, FALSE) == CP_GET_SUCCESS);
+    return (CpGetByte(&Rs232ComPort, ByteReceived, FALSE, FALSE) == CP_GET_SUCCESS);
 }
 */
 
diff --git a/reactos/drivers/base/kdcom/kdcom.c b/reactos/drivers/base/kdcom/kdcom.c
index d808025cf7b..d3edc3c8c8e 100644
--- a/reactos/drivers/base/kdcom/kdcom.c
+++ b/reactos/drivers/base/kdcom/kdcom.c
@@ -222,7 +222,7 @@ NTAPI
 KdpPollByte(OUT PUCHAR OutByte)
 {
     /* Poll the byte */
-    if (CpGetByte(&KdDebugComPort, OutByte, FALSE, TRUE) == CP_GET_SUCCESS)
+    if (CpGetByte(&KdDebugComPort, OutByte, FALSE, FALSE) == CP_GET_SUCCESS)
     {
         return KDP_PACKET_RECEIVED;
     }
diff --git a/reactos/ntoskrnl/kd/i386/kdbg.c b/reactos/ntoskrnl/kd/i386/kdbg.c
index 0607112584b..fcc2afdf02c 100644
--- a/reactos/ntoskrnl/kd/i386/kdbg.c
+++ b/reactos/ntoskrnl/kd/i386/kdbg.c
@@ -136,7 +136,7 @@ KdPortGetByteEx(
     IN PCPPORT PortInformation,
     OUT PUCHAR ByteReceived)
 {
-    return (CpGetByte(PortInformation, ByteReceived, FALSE, TRUE) == CP_GET_SUCCESS);
+    return (CpGetByte(PortInformation, ByteReceived, FALSE, FALSE) == CP_GET_SUCCESS);
 }
 
 VOID