diff --git a/pkgs/os-specific/linux/kernel/generate-config.pl b/pkgs/os-specific/linux/kernel/generate-config.pl
index 57d3ab739cb6..18d1f2150562 100644
--- a/pkgs/os-specific/linux/kernel/generate-config.pl
+++ b/pkgs/os-specific/linux/kernel/generate-config.pl
@@ -100,7 +100,13 @@ sub runConfig {
             elsif ($line =~ /choice\[(.*)\]: ###$/) {
                 my $answer = "";
                 foreach my $name (keys %choices) {
-                    $answer = $choices{$name} if ($answers{$name} || "") eq "y";
+                    if (($answers{$name} || "") eq "y") {
+                        if ($answer eq "") {
+                            $answer = $choices{$name};
+                        } else {
+                            die "conflicting answers!"
+                        }
+                    }
                 }
                 print STDERR "CHOICE: $1, ANSWER: $answer\n" if $debug;
                 print OUT "$answer\n" if $1 =~ /-/;