diff --git a/lib/isc/include/isc/Makefile.in b/lib/isc/include/isc/Makefile.in
index 294e8ee7c5..1c38844c9e 100644
--- a/lib/isc/include/isc/Makefile.in
+++ b/lib/isc/include/isc/Makefile.in
@@ -32,7 +32,7 @@ HEADERS =	aes.h app.h assertions.h atomic.h backtrace.h base32.h base64.h \
 		radix.h random.h ratelimiter.h refcount.h regex.h \
 		region.h resource.h result.h resultclass.h rwlock.h \
 		safe.h serial.h sha1.h sha2.h sockaddr.h socket.h \
-		stats.h stdio.h stdlib.h strerr.h string.h symtab.h \
+		stats.h stdio.h strerr.h string.h symtab.h \
 	        task.h taskpool.h timer.h tm.h types.h util.h version.h \
 		xml.h
 
diff --git a/lib/isc/unix/include/isc/Makefile.in b/lib/isc/unix/include/isc/Makefile.in
index 720fb0c24f..001115c4d2 100644
--- a/lib/isc/unix/include/isc/Makefile.in
+++ b/lib/isc/unix/include/isc/Makefile.in
@@ -14,7 +14,7 @@ top_srcdir =	@top_srcdir@
 VERSION=@BIND9_VERSION@
 
 HEADERS =	dir.h net.h netdb.h offset.h stat.h \
-		stdtime.h strerror.h syslog.h time.h
+		stdtime.h syslog.h time.h
 
 SUBDIRS =
 TARGETS =