diff --git a/lib/dns/journal.c b/lib/dns/journal.c
index 22fc6b0211..e762406e06 100644
--- a/lib/dns/journal.c
+++ b/lib/dns/journal.c
@@ -22,6 +22,7 @@
 #include <unistd.h>
 
 #include <isc/mem.h>
+#include <isc/net.h>		/* Required for ntohl. */
 #include <isc/string.h>
 #include <isc/util.h>