diff --git a/include/hw/timer/mc146818rtc.h b/include/hw/timer/mc146818rtc.h
index 753dda6ae7..eaf649767f 100644
--- a/include/hw/timer/mc146818rtc.h
+++ b/include/hw/timer/mc146818rtc.h
@@ -9,6 +9,5 @@
 ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq);
 void rtc_set_memory(ISADevice *dev, int addr, int val);
 int rtc_get_memory(ISADevice *dev, int addr);
-void rtc_set_date(ISADevice *dev, const struct tm *tm);
 
 #endif /* !MC146818RTC_H */