diff --git a/headers/private/kernel/real_time_clock.h b/headers/private/kernel/real_time_clock.h
index b2aab5ae01..ede4d7fb10 100644
--- a/headers/private/kernel/real_time_clock.h
+++ b/headers/private/kernel/real_time_clock.h
@@ -17,10 +17,9 @@ status_t rtc_init(kernel_args *args);
 bigtime_t rtc_boot_time(void);
 	// Returns the time at which the system was booted in microseconds since Jan 1, 1970.
 
-status_t set_tzspecs(int32 timezone_offset, bool dst_observed);
-
 status_t _user_set_real_time_clock(uint32 time);
 status_t _user_set_tzspecs(int32 timezone_offset, bool dst_observed);
+status_t _user_set_tzfilename(const char* filename, size_t length, bool isGMT);
 
 #ifdef __cplusplus
 }