diff --git a/src/add-ons/kernel/drivers/input/ps2_hid/common.c b/src/add-ons/kernel/drivers/input/ps2_hid/common.c
index 9e6173625e..7c68778bbb 100644
--- a/src/add-ons/kernel/drivers/input/ps2_hid/common.c
+++ b/src/add-ons/kernel/drivers/input/ps2_hid/common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2004 Haiku, Inc.
+ * Copyright 2004-2005 Haiku, Inc.
  * Distributed under the terms of the Haiku License.
  *
  * common.c:
@@ -9,6 +9,7 @@
  */
 
 #include <Drivers.h>
+#include <string.h>
 
 #include "common.h"
 
diff --git a/src/add-ons/kernel/drivers/input/ps2_hid/mouse.c b/src/add-ons/kernel/drivers/input/ps2_hid/mouse.c
index 60d1c02e3d..2c631899ff 100644
--- a/src/add-ons/kernel/drivers/input/ps2_hid/mouse.c
+++ b/src/add-ons/kernel/drivers/input/ps2_hid/mouse.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2004 Haiku, Inc.
+ * Copyright 2001-2005 Haiku, Inc.
  * Distributed under the terms of the Haiku License.
  *
  * ps2mouse.c:
@@ -79,7 +79,7 @@ static bigtime_t sClickSpeed;
 static int32 sClickCount;
 static int sButtonsState;
 
-static uint32 sPacketSize;
+static int32 sPacketSize;
  
 /////////////////////////////////////////////////////////////////////////
 // mouse functions
@@ -268,7 +268,7 @@ mouse_open(const char *name, uint32 flags, void **cookie)
 {
 	status_t status;	
 	int8 commandByte;
-	int8 deviceId;
+	int8 deviceId = -1;
 	
 	TRACE(("mouse_open()\n"));