diff --git a/obs-service-format_spec_file.spec b/obs-service-format_spec_file.spec
index dd0eb07..e442aba 100644
--- a/obs-service-format_spec_file.spec
+++ b/obs-service-format_spec_file.spec
@@ -30,7 +30,7 @@ Source3:        patch_license
 Source4:        licenses_changes.txt
 Source100:      COPYING
 Requires:       osc-source_validator
-BuildRoot:	%{_tmppath}/%{name}-%{version}-build
+BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildArch:      noarch
 
 %description
diff --git a/prepare_spec b/prepare_spec
index 2e77a6e..0630f3d 100644
--- a/prepare_spec
+++ b/prepare_spec
@@ -522,7 +522,7 @@ sub read_and_parse_old_spec {
       }
 
       if ( /^BuildRoot\s*:/i ) {
-	push @oldspec, "BuildRoot:	%{_tmppath}/%{name}-%{version}-build";
+	push @oldspec, sprintf("%-16s%s", "BuildRoot:", "%{_tmppath}/%{name}-%{version}-build");
 	next;
       }