diff --git a/include/libopencm3/stm32/f1/rtc.h b/include/libopencm3/stm32/f1/rtc.h
index d9c26398..5e203ab9 100644
--- a/include/libopencm3/stm32/f1/rtc.h
+++ b/include/libopencm3/stm32/f1/rtc.h
@@ -23,6 +23,7 @@
 #include <libopencm3/stm32/memorymap.h>
 #include <libopencm3/cm3/common.h>
 #include <libopencm3/stm32/pwr.h>
+#include <libopencm3/stm32/f1/rcc.h>
 
 /* --- RTC registers ------------------------------------------------------- */