diff --git a/reactos/drivers/input/i8042prt/i8042prt.h b/reactos/drivers/input/i8042prt/i8042prt.h
index 8ece980f023..03290663030 100644
--- a/reactos/drivers/input/i8042prt/i8042prt.h
+++ b/reactos/drivers/input/i8042prt/i8042prt.h
@@ -46,6 +46,8 @@ typedef struct _CONNECT_DATA {
 #define KEYBOARD_NUM_LOCK_ON 0x02
 #define KEYBOARD_CAPS_LOCK_ON 0x04
 
+#define WHEEL_DELTA 120
+
 /*-----------------------------------------------------
  *  DeviceExtension
  * --------------------------------------------------*/
diff --git a/reactos/drivers/input/i8042prt/mouse.c b/reactos/drivers/input/i8042prt/mouse.c
index 052e0358708..50c429a413c 100644
--- a/reactos/drivers/input/i8042prt/mouse.c
+++ b/reactos/drivers/input/i8042prt/mouse.c
@@ -489,7 +489,7 @@ VOID STDCALL I8042MouseHandle(PDEVICE_EXTENSION DevExt,
 
 		if (Scroll) {
 			MouseInput->RawButtons |= MOUSE_WHEEL;
-			MouseInput->ButtonData = (USHORT) Scroll;
+			MouseInput->ButtonData = (USHORT)(Scroll * -WHEEL_DELTA);
 		}
 
 		if (DevExt->MouseType == IntellimouseExplorer) {