diff -up jwhois-4.0/src/jwhois.c.orig jwhois-4.0/src/jwhois.c
--- jwhois-4.0/src/jwhois.c.orig	2014-06-10 15:27:33.944422031 +0200
+++ jwhois-4.0/src/jwhois.c	2014-06-10 15:28:47.235677030 +0200
@@ -120,8 +120,19 @@ main(int argc, char **argv)
   rc = idn2_lookup_ul(argv[optind], &idn, 0);
   if (rc != IDN2_OK)
     {
-      printf("[IDN encoding of '%s' failed: %s)]\n", argv[optind], idn2_strerror(rc));
-      exit(1);
+      if (rc == IDN2_TOO_BIG_LABEL)
+        {
+          if ((idn = strdup(argv[optind])) == NULL)
+            {
+              printf("[%s]\n", _("Error allocating memory"));
+              exit(1);
+            }
+        }
+      else
+        {
+          printf("[IDN encoding of '%s' failed: %s)]\n", argv[optind], idn2_strerror(rc));
+          exit(1);
+        }
     }
   qstring = realloc(qstring, count+strlen(idn)+1);
   memcpy(qstring+count, idn, strlen(idn)+1);