diff --git a/lib/dns/adb.c b/lib/dns/adb.c
index 40c6de48a6..d03f791175 100644
--- a/lib/dns/adb.c
+++ b/lib/dns/adb.c
@@ -32,6 +32,7 @@
 
 #include <config.h>
 
+#include <limits.h>
 #include <stdio.h>
 #include <string.h>