diff --git a/reactos/drivers/input/sermouse/sermouse.c b/reactos/drivers/input/sermouse/sermouse.c
index 9f73ee80630..f1b64e189d5 100644
--- a/reactos/drivers/input/sermouse/sermouse.c
+++ b/reactos/drivers/input/sermouse/sermouse.c
@@ -11,6 +11,12 @@
 #include <ddk/ntddk.h>
 #include <ddk/ntddmou.h>
 
+/*
+ * HAL:KdComPortInUse used to prevent detecting mouse on port
+ * that is occupied by kernel debugger.
+ */
+ULONG DECLSPEC_IMPORT KdComPortInUse;
+
 /*
  * Compile time options
  */
@@ -568,6 +574,10 @@ InitializeMouse(ULONG Port, ULONG Irq, PDRIVER_OBJECT DriverObject)
 	KAFFINITY Affinity;
 	ULONG MouseType;
 
+	/* Don't detect mouse on port that is occupied by kernel debugger */
+	if (KdComPortInUse == Port)
+		return FALSE;
+
 	/* Try to detect mouse on specified port */
 	MouseType = DetectMicrosoftMouse(Port);