diff --git a/ardour-3.ttl b/ardour-3.ttl
index 1bd5df264f..540bf5598e 100644
--- a/ardour-3.ttl
+++ b/ardour-3.ttl
@@ -6,7 +6,7 @@
 
 <http://ardour.org/software/ardour3> a doap:Project, hi:Host ;
     doap:name "Ardour" ;
-	doap:revision "3.0" ;
+    doap:revision "3.0" ;
     doap:shortdesc "A Digital Audio Workstation (DAW)." ;
     doap:homepage <http://ardour.org/> ;
     doap:bug-database <http://tracker.ardour.org/> ;
@@ -21,11 +21,11 @@
         a doap:SVNRepository ;
         doap:location <http://subversion.ardour.org/svn/ardour2/branches/3.0/>
     ] ;
-	hi:supportsExtension [
-		hi:extension <http://lv2plug.in/ns/extensions/ui> ;
-	] , [
-		hi:extension <http://lv2plug.in/ns/dev/presets> ;
-	] ;
+    hi:supportsExtension [
+        hi:extension <http://lv2plug.in/ns/extensions/ui> ;
+    ] , [
+        hi:extension <http://lv2plug.in/ns/dev/presets> ;
+    ] ;
     doap:description """
 Ardour is a hard disk recorder and Digital Audio Workstation (DAW) application.
 Ardour can record and play back an unlimited number of tracks of audio and/or