diff --git a/c/src/lib/libcpu/bfin/Makefile.am b/c/src/lib/libcpu/bfin/Makefile.am
index 2e74c1e911..06e2315457 100644
--- a/c/src/lib/libcpu/bfin/Makefile.am
+++ b/c/src/lib/libcpu/bfin/Makefile.am
@@ -82,7 +82,7 @@ clock_rel_CPPFLAGS = $(AM_CPPFLAGS)
 clock_rel_LDFLAGS = $(RTEMS_RELLDFLAGS)
 
 noinst_PROGRAMS += rtc.rel
-rtc_rel_SOURCES = clock/rtc.c
+rtc_rel_SOURCES = clock/rtc.c clock/rtc.h
 rtc_rel_CPPFLAGS = $(AM_CPPFLAGS)
 rtc_rel_LDFLAGS = $(RTEMS_RELLDFLAGS)