diff --git a/scripts/nix-pull b/scripts/nix-pull
index a15af63020..86d9f4b114 100644
--- a/scripts/nix-pull
+++ b/scripts/nix-pull
@@ -18,53 +18,53 @@ while (<CONFFILE>) {
 
         print "obtaining list of Nix archives at $url...\n";
 
-	system "wget '$url' -O '$tmpfile' 2> /dev/null"; # !!! escape
-	if ($?) { die "`wget' failed"; }
-	
-	open INDEX, "<$tmpfile";
+        system "wget '$url' -O '$tmpfile' 2> /dev/null"; # !!! escape
+        if ($?) { die "`wget' failed"; }
+        
+        open INDEX, "<$tmpfile";
 
-	while (<INDEX>) {
-	    # Get all links to prebuilts, that is, file names of the
-	    # form foo-HASH-HASH.tar.bz2.
-	    next unless (/HREF=\"([^\"]*)\"/);
-	    my $fn = $1;
-	    next if $fn =~ /\.\./;
-	    next if $fn =~ /\//;
-	    next unless $fn =~ /([0-9a-z]{32})-([0-9a-z]{32})\.nar/;
-	    my $hash = $2;
+        while (<INDEX>) {
+            # Get all links to prebuilts, that is, file names of the
+            # form foo-HASH-HASH.tar.bz2.
+            next unless (/HREF=\"([^\"]*)\"/);
+            my $fn = $1;
+            next if $fn =~ /\.\./;
+            next if $fn =~ /\//;
+            next unless $fn =~ /([0-9a-z]{32})-([0-9a-z]{32})\.nar/;
+            my $hash = $2;
 
-	    print "registering $hash -> $url/$fn\n";
+            print "registering $hash -> $url/$fn\n";
 
-	    # Construct a Fix expression that fetches and unpacks a
-	    # Nix archive from the network.
-	    my $fetch =
+            # Construct a Fix expression that fetches and unpacks a
+            # Nix archive from the network.
+            my $fetch =
               "App(IncludeFix(\"fetchurl/fetchurl.fix\"), " .
               "[(\"url\", \"$url/$fn\"), (\"hash\", \"\")])";
-	    my $fixexpr = 
-		"App(IncludeFix(\"nar/unnar.fix\"), " .
-		"[ (\"nar\", $fetch)" .
-		", (\"name\", \"fetched-$hash\")" .
-		"])";
-	    
-	    my $fixfile = "/tmp/nix-pull-tmp.fix";
-	    open FIX, ">$fixfile";
-	    print FIX $fixexpr;
-	    close FIX;
+            my $fixexpr = 
+                "App(IncludeFix(\"nar/unnar.fix\"), " .
+                "[ (\"nar\", $fetch)" .
+                ", (\"name\", \"fetched-$hash\")" .
+                "])";
+            
+            my $fixfile = "/tmp/nix-pull-tmp.fix";
+            open FIX, ">$fixfile";
+            print FIX $fixexpr;
+            close FIX;
 
-	    # Instantiate a Nix expression from the Fix expression.
-	    my $nhash = `fix $fixfile`;
-	    $? and die "instantiating Nix archive expression";
-	    chomp $nhash;
-	    die unless $nhash =~ /^([0-9a-z]{32})$/;
+            # Instantiate a Nix expression from the Fix expression.
+            my $nhash = `fix $fixfile`;
+            $? and die "instantiating Nix archive expression";
+            chomp $nhash;
+            die unless $nhash =~ /^([0-9a-z]{32})$/;
 
-	    push @subs, $hash;
-	    push @subs, $nhash;
+            push @subs, $hash;
+            push @subs, $nhash;
 
-	}
+        }
 
-	close INDEX;
+        close INDEX;
 
-	unlink $tmpfile;
+        unlink $tmpfile;
     }
 
 }
diff --git a/scripts/nix-push b/scripts/nix-push
index 14b7e28346..731532f1e9 100644
--- a/scripts/nix-push
+++ b/scripts/nix-push
@@ -11,9 +11,9 @@ foreach my $hash (@ARGV) {
     my @paths;
     open PATHS, "nix -qrh $hash 2> /dev/null |" or die "nix -qrh";
     while (<PATHS>) {
-	chomp;
-	next unless /^\//;
-	push @paths, $_;
+        chomp;
+        next unless /^\//;
+        push @paths, $_;
     }
     close PATHS;
 
@@ -21,38 +21,38 @@ foreach my $hash (@ARGV) {
     # a Nix archive.
     foreach my $path (@paths) {
 
-	# Hash the path.
-	my $phash = `nix-hash $path`;
-	$? and die "nix-hash";
-	chomp $phash;
-	die unless $phash =~ /^([0-9a-z]{32})$/;
+        # Hash the path.
+        my $phash = `nix-hash $path`;
+        $? and die "nix-hash";
+        chomp $phash;
+        die unless $phash =~ /^([0-9a-z]{32})$/;
 
-	# Construct a Fix expression that creates a Nar archive.
-	my $fixexpr = 
+        # Construct a Fix expression that creates a Nar archive.
+        my $fixexpr = 
           "App(IncludeFix(\"nar/nar.fix\"), " .
           "[ (\"path\", Path(\"$path\", Hash(\"$phash\"), [Include(\"$hash\")]))" .
           ", (\"name\", \"$phash.nar\")" .
           "])";
 	
-	my $fixfile = "/tmp/nix-push-tmp.fix";
-	open FIX, ">$fixfile";
-	print FIX $fixexpr;
-	close FIX;
+        my $fixfile = "/tmp/nix-push-tmp.fix";
+        open FIX, ">$fixfile";
+        print FIX $fixexpr;
+        close FIX;
 
-	# Instantiate a Nix expression from the Fix expression.
-	my $nhash = `fix $fixfile`;
-	$? and die "instantiating Nix archive expression";
-	chomp $nhash;
-	die unless $nhash =~ /^([0-9a-z]{32})$/;
+        # Instantiate a Nix expression from the Fix expression.
+        my $nhash = `fix $fixfile`;
+        $? and die "instantiating Nix archive expression";
+        chomp $nhash;
+        die unless $nhash =~ /^([0-9a-z]{32})$/;
 
-	# Realise the Nix expression.
-	my $npath = `nix -qph $nhash 2> /dev/null`;
-	$? and die "creating Nix archive";
-	chomp $npath;
+        # Realise the Nix expression.
+        my $npath = `nix -qph $nhash 2> /dev/null`;
+        $? and die "creating Nix archive";
+        chomp $npath;
 
-	push @pushlist, $npath;
+        push @pushlist, $npath;
 
-	print "$path -> $npath\n";
+        print "$path -> $npath\n";
     }
 }