diff --git a/lib/dns/keystore.c b/lib/dns/keystore.c
index 19973b8b5f..82652d5d7d 100644
--- a/lib/dns/keystore.c
+++ b/lib/dns/keystore.c
@@ -17,6 +17,7 @@
 
 #include <isc/assertions.h>
 #include <isc/buffer.h>
+#include <isc/dir.h>
 #include <isc/mem.h>
 #include <isc/time.h>
 #include <isc/util.h>