diff --git a/scripts/nroff2cd b/scripts/nroff2cd
index 17361b227b..b0308b6ef0 100755
--- a/scripts/nroff2cd
+++ b/scripts/nroff2cd
@@ -36,6 +36,9 @@ for code.
 =end comment
 =cut
 
+use strict;
+use warnings;
+
 my $nroff2cd = "0.1"; # to keep check
 
 sub single {
@@ -189,4 +192,6 @@ HEAD
     return !$header;
 }
 
-exit single($ARGV[0]);
+if(@ARGV) {
+  exit single($ARGV[0]);
+}