diff --git a/programs/develop/libraries/menuetlibc/include/menuet/os.h b/programs/develop/libraries/menuetlibc/include/menuet/os.h
index dd9493bade..726d8d3f94 100644
--- a/programs/develop/libraries/menuetlibc/include/menuet/os.h
+++ b/programs/develop/libraries/menuetlibc/include/menuet/os.h
@@ -75,7 +75,7 @@ __u32 __menuet__get_date(void);
 
 void __menuet__line(__u16 x1,__u16 y1,__u16 x2,__u16 y2,__u32 color);
 
-void __menuet__set_bitfield_for_wanted_events(__u16 ev);
+void __menuet__set_bitfield_for_wanted_events(__u32 ev);
 
 #define EVENT_REDRAW              0x00000001
 #define EVENT_KEY                 0x00000002
@@ -83,9 +83,9 @@ void __menuet__set_bitfield_for_wanted_events(__u16 ev);
 #define EVENT_END_REQUEST         0x00000008
 #define EVENT_DESKTOP_BACK_DRAW   0x00000010
 #define EVENT_MOUSE_CHANGE        0x00000020
-#define EVENT_IPC		  0x00000040
-#define EVENT_GET_IRQS_MASK       0xFFFF0000
-#define EVENT_GET_IRQ(e)          (((e)>>16)&0xFFFF)
+#define EVENT_IPC		          0x00000040
+#define EVENT_MOUSE_CURSOR_MASK   0x40000000	// the window does not receive mouse events if cursor outside window
+#define EVENT_MOUSE_WINDOW_MASK   0x80000000	// inactive window does not receive mouse events
 
 __u32 __menuet__get_irq_owner(__u32 irq);
 int __menuet__get_data_read_by_irq(__u32 irq,__u32 * num_bytes_in_buf,__u8 * data);
diff --git a/programs/develop/libraries/menuetlibc/src/libc/menuetos/event.c b/programs/develop/libraries/menuetlibc/src/libc/menuetos/event.c
index 47c5ee5fb1..f5c8fc5f04 100644
--- a/programs/develop/libraries/menuetlibc/src/libc/menuetos/event.c
+++ b/programs/develop/libraries/menuetlibc/src/libc/menuetos/event.c
@@ -14,7 +14,7 @@ int __menuet__check_for_event(void)
  return __ret;
 }
 
-void __menuet__set_bitfield_for_wanted_events(__u16 ev)
+void __menuet__set_bitfield_for_wanted_events(__u32 ev)
 {
  __asm__ __volatile__("int $0x40"::"a"(40),"b"(ev));
 }