diff --git a/lib/dns/include/dns/view.h b/lib/dns/include/dns/view.h
index efa1cac78a..b8495f6eff 100644
--- a/lib/dns/include/dns/view.h
+++ b/lib/dns/include/dns/view.h
@@ -48,6 +48,7 @@
 #include <isc/types.h>
 #include <isc/lang.h>
 #include <isc/event.h>
+#include <isc/mutex.h>
 
 #include <dns/types.h>
 #include <dns/result.h>