diff --git a/lib/dns/tests/dnstest.c b/lib/dns/tests/dnstest.c
index 0b1d9e7bf9..370a60f7a3 100644
--- a/lib/dns/tests/dnstest.c
+++ b/lib/dns/tests/dnstest.c
@@ -18,6 +18,7 @@
 
 #include <config.h>
 
+#include <stdlib.h>
 #include <time.h>
 #include <unistd.h>