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-rw-r--r--resolv/res_debug.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/resolv/res_debug.c b/resolv/res_debug.c
index c2fefb4750..4cbed577f8 100644
--- a/resolv/res_debug.c
+++ b/resolv/res_debug.c
@@ -66,6 +66,7 @@ static char rcsid[] = "$Id$";
 #include <arpa/nameser.h>
 
 #include <stdio.h>
+#include <ctype.h>
 #include <netdb.h>
 #include <resolv.h>
 #if defined(BSD) && (BSD >= 199103) && defined(AF_INET6)