diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index 7dcec384..82dc264a 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -88,7 +88,7 @@ main (int argc, char **argv)
   bool parse_address = false; /* This flag scans for Address: but only after Name: */
   output chld_out, chld_err;
   size_t i;
-  int is_nxdomain = false;
+  bool is_nxdomain = false;
 
   setlocale (LC_ALL, "");
   bindtextdomain (PACKAGE, LOCALEDIR);