diff --git a/pkgs/os-specific/linux/kernel/generate-config.pl b/pkgs/os-specific/linux/kernel/generate-config.pl
index e8349db8ec8a..be5118672e3b 100644
--- a/pkgs/os-specific/linux/kernel/generate-config.pl
+++ b/pkgs/os-specific/linux/kernel/generate-config.pl
@@ -130,7 +130,6 @@ close CONFIG;
 foreach my $name (sort (keys %answers)) {
     my $f = $requiredAnswers{$name} && $ENV{'ignoreConfigErrors'} ne "1"
         ? sub { die @_; } : sub { warn @_; };
-    my $f = sub { warn @_; };
     &$f("unused option: $name\n") unless defined $config{$name};
     &$f("option not set correctly: $name\n")
         if $config{$name} && $config{$name} ne $answers{$name};