diff --git a/libs/ardour/wscript b/libs/ardour/wscript
index 9e721aee2c..dde1a686b3 100644
--- a/libs/ardour/wscript
+++ b/libs/ardour/wscript
@@ -46,7 +46,7 @@ libardour_sources = [
         'automation_control.cc',
         'automation_list.cc',
         'automation_watch.cc',
-  #  'beatbox.cc',
+        # 'beatbox.cc',
         'broadcast_info.cc',
         'buffer.cc',
         'buffer_manager.cc',
@@ -147,8 +147,8 @@ libardour_sources = [
         'midi_ui.cc',
         'mididm.cc',
         'midiport_manager.cc',
-	'minibpm.cc',
-	'mix.cc',
+        'minibpm.cc',
+        'mix.cc',
         'mode.cc',
         'monitor_control.cc',
         'monitor_port.cc',
@@ -249,9 +249,9 @@ libardour_sources = [
         'speakers.cc',
         'srcfilesource.cc',
         'stripable.cc',
-  # 'step_sequencer.cc',
+        # 'step_sequencer.cc',
         'strip_silence.cc',
-	'system_exec.cc',
+        'system_exec.cc',
         'revision.cc',
         'rt_midibuffer.cc',
         'template_utils.cc',