diff --git a/lib/isc/unix/include/isc/Makefile.in b/lib/isc/unix/include/isc/Makefile.in
index ae524729f2..9ab0f05886 100644
--- a/lib/isc/unix/include/isc/Makefile.in
+++ b/lib/isc/unix/include/isc/Makefile.in
@@ -19,7 +19,7 @@ top_srcdir =	@top_srcdir@
 
 @BIND9_VERSION@
 
-HEADERS =	app.h dir.h int.h net.h netdb.h stdtime.h time.h
+HEADERS =	app.h dir.h int.h net.h netdb.h offset.h stdtime.h time.h
 
 SUBDIRS =
 TARGETS =