diff --git a/contrib/sdk/sources/newlib/libc/include/sys/ksys.h b/contrib/sdk/sources/newlib/libc/include/sys/ksys.h
index d42ab6a66..2a165c547 100644
--- a/contrib/sdk/sources/newlib/libc/include/sys/ksys.h
+++ b/contrib/sdk/sources/newlib/libc/include/sys/ksys.h
@@ -1106,18 +1106,6 @@ KOSAPI ksys_set_time_err _ksys_set_date(ksys_date_bcd_t date)
         : "a"(22), "b"(1), "c"(date));
 }
 
-/*============= Function 23 - wait for event with timeout. =============*/
-
-KOSAPI uint32_t _ksys_wait_event_timeout(uint32_t timeout)
-{
-    unsigned val;
-    asm_inline(
-        "int $0x40"
-        : "=a"(val)
-        : "a"(23), "b"(timeout));
-    return val;
-}
-
 /*========= Function 26, subfunction 2 - get keyboard layout. ==========*/
 
 KOSAPI uint32_t _ksys_keyboard_layout(ksys_keyboard_layout_t layout, unsigned char* buf)
@@ -1149,19 +1137,6 @@ KOSAPI ksys_lang_t _ksys_get_lang()
     return lang;
 }
 
-/*===================== Function 18, subfunction 21 ====================*/
-/*=====Get the slot number of the process / thread by identifier.. =====*/
-
-KOSAPI int _ksys_get_thread_slot(int PID)
-{
-    int val;
-    asm_inline(
-        "int $0x40"
-        : "=a"(val)
-        : "a"(18), "b"(21), "c"(PID));
-    return val;
-}
-
 /*============= Function 23 - wait for event with timeout. =============*/
 
 KOSAPI uint32_t _ksys_wait_event_timeout(uint32_t timeout)