diff --git a/scripts/headers_install.pl b/scripts/headers_install.pl
index b89ca2c..4ca3be3 100644
--- a/scripts/headers_install.pl
+++ b/scripts/headers_install.pl
@@ -23,13 +23,13 @@
 my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
 
 foreach my $file (@files) {
-	local *INFILE;
-	local *OUTFILE;
 	my $tmpfile = "$installdir/$file.tmp";
-	open(INFILE, "<$readdir/$file")
-		or die "$readdir/$file: $!\n";
-	open(OUTFILE, ">$tmpfile") or die "$tmpfile: $!\n";
-	while (my $line = <INFILE>) {
+
+	open(my $in, '<', "$readdir/$file")
+	    or die "$readdir/$file: $!\n";
+	open(my $out, '>', $tmpfile)
+	    or die "$tmpfile: $!\n";
+	while (my $line = <$in>) {
 		$line =~ s/([\s(])__user\s/$1/g;
 		$line =~ s/([\s(])__force\s/$1/g;
 		$line =~ s/([\s(])__iomem\s/$1/g;
@@ -39,10 +39,11 @@
 		$line =~ s/(^|\s)(inline)\b/$1__$2__/g;
 		$line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
 		$line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
-		printf OUTFILE "%s", $line;
+		printf {$out} "%s", $line;
 	}
-	close OUTFILE;
-	close INFILE;
+	close $out;
+	close $in;
+
 	system $unifdef . " $tmpfile > $installdir/$file";
 	unlink $tmpfile;
 }