diff --git a/nixos/modules/installer/tools/nixos-generate-config.pl b/nixos/modules/installer/tools/nixos-generate-config.pl
index cabdb09ec9c1..73dd87cef5cf 100644
--- a/nixos/modules/installer/tools/nixos-generate-config.pl
+++ b/nixos/modules/installer/tools/nixos-generate-config.pl
@@ -344,19 +344,19 @@ EOF
         }
     }
 
-	# Is this a btrfs filesystem?
-	if ($fsType eq "btrfs") {
-		my ($status, @info) = runCommand("btrfs subvol show $rootDir$mountPoint");
-		if ($status != 0) {
-			die "Failed to retreive subvolume info for $mountPoint";
-		}
-		my @subvols = join("", @info) =~ m/Name:[ \t\n]*([^ \t\n]*)/;
-		if ($#subvols > 0) {
-			die "Btrfs subvol name for $mountPoint listed multiple times in mount\n"
-		} elsif ($#subvols == 0) {
-			push @extraOptions, "subvol=$subvols[0]";
-		}
-	}
+    # Is this a btrfs filesystem?
+    if ($fsType eq "btrfs") {
+        my ($status, @info) = runCommand("btrfs subvol show $rootDir$mountPoint");
+        if ($status != 0) {
+            die "Failed to retreive subvolume info for $mountPoint";
+        }
+        my @subvols = join("", @info) =~ m/Name:[ \t\n]*([^ \t\n]*)/;
+        if ($#subvols > 0) {
+            die "Btrfs subvol name for $mountPoint listed multiple times in mount\n"
+        } elsif ($#subvols == 0) {
+            push @extraOptions, "subvol=$subvols[0]";
+        }
+    }
 
     # Emit the filesystem.
     $fileSystems .= <<EOF;
diff --git a/nixos/modules/system/boot/loader/grub/install-grub.pl b/nixos/modules/system/boot/loader/grub/install-grub.pl
index d8ee8b500970..7ced51f57e16 100644
--- a/nixos/modules/system/boot/loader/grub/install-grub.pl
+++ b/nixos/modules/system/boot/loader/grub/install-grub.pl
@@ -158,7 +158,7 @@ my $grubStore = GrubFs("/nix");
 
 # We don't need to copy if we can read the kernels directly
 if ($grubStore->search ne "") {
-	$copyKernels = 0;
+    $copyKernels = 0;
 }
 
 # Generate the header.
@@ -275,8 +275,8 @@ sub addEntry {
         $conf .= "  " . ($xen ? "module" : "initrd") . " $initrd\n\n";
     } else {
         $conf .= "menuentry \"$name\" {\n";
-	$conf .= $grubBoot->search . "\n";
-	$conf .= $grubStore->search . "\n";
+        $conf .= $grubBoot->search . "\n";
+        $conf .= $grubStore->search . "\n";
         $conf .= "  $extraPerEntryConfig\n" if $extraPerEntryConfig;
         $conf .= "  multiboot $xen $xenParams\n" if $xen;
         $conf .= "  " . ($xen ? "module" : "linux") . " $kernel $kernelParams\n";