diff --git a/src/idn2.c b/src/idn2.c
index 6abbc72..804f0f2 100644
--- a/src/idn2.c
+++ b/src/idn2.c
@@ -31,7 +31,6 @@
 #include <unistr.h>
 
 /* Gnulib headers. */
-#include "error.h"
 #include "gettext.h"
 #define _(String) dgettext (PACKAGE, String)
 #include "progname.h"
@@ -161,9 +160,7 @@ process_input (char *readbuf, int flags)
       free (output);
     }
   else
-    error (EXIT_FAILURE, 0, "%s: %s",
-	   args_info.register_given ? "register" : "lookup",
-	   idn2_strerror (rc));
+    perror (idn2_strerror (rc));
 }
 
 int
@@ -222,7 +219,7 @@ main (int argc, char *argv[])
     }
 
   if (ferror (stdin))
-    error (EXIT_FAILURE, errno, "%s", _("input error"));
+    perror (_("input error"));
 
   cmdline_parser_free (&args_info);