diff --git a/gtk2_ardour/wscript b/gtk2_ardour/wscript
index 4c0ab65c37..1cad4e6dcd 100644
--- a/gtk2_ardour/wscript
+++ b/gtk2_ardour/wscript
@@ -20,8 +20,8 @@ out = 'build'
 from waflib import TaskGen
 @TaskGen.extension('.m')
 def m_hook(self, node):
-	"""Alias .m files to be compiled the same as .c files, gcc will do the right thing."""
-	return self.create_compiled_task('c', node)
+    """Alias .m files to be compiled the same as .c files, gcc will do the right thing."""
+    return self.create_compiled_task('c', node)
 
 path_prefix = 'gtk2_ardour/'
 
diff --git a/libs/canvas/wscript b/libs/canvas/wscript
index 04a21b2f9e..7de151834e 100644
--- a/libs/canvas/wscript
+++ b/libs/canvas/wscript
@@ -58,7 +58,7 @@ canvas_sources = [
         'scroll_group.cc',
         'stateful_image.cc',
         'step_button.cc',
-	'table.cc',
+        'table.cc',
         'text.cc',
         'tracking_text.cc',
         'types.cc',
diff --git a/libs/surfaces/maschine2/wscript b/libs/surfaces/maschine2/wscript
index 2ae1a2a144..40e8ecbc9a 100644
--- a/libs/surfaces/maschine2/wscript
+++ b/libs/surfaces/maschine2/wscript
@@ -19,14 +19,14 @@ def build(bld):
             maschine2.cc
             callbacks.cc
             canvas.cc
-	    interface.cc
-	    layout.cc
-	    m2_dev_mk2.cc
-	    m2_map_mk2.cc
-	    m2_dev_mikro.cc
-	    m2_map_mikro.cc
-	    ui_knob.cc
-	    ui_menu.cc
+            interface.cc
+            layout.cc
+            m2_dev_mk2.cc
+            m2_map_mk2.cc
+            m2_dev_mikro.cc
+            m2_map_mikro.cc
+            ui_knob.cc
+            ui_menu.cc
     '''
     obj.export_includes = ['.']
     obj.defines      = [ 'PACKAGE="ardour_maschine2"' ]
diff --git a/libs/surfaces/push2/wscript b/libs/surfaces/push2/wscript
index b26777ea94..1ba7ed53ca 100644
--- a/libs/surfaces/push2/wscript
+++ b/libs/surfaces/push2/wscript
@@ -19,19 +19,19 @@ def build(bld):
             push2.cc
             buttons.cc
             canvas.cc
-	    interface.cc
+            interface.cc
             midi_byte_array.cc
             leds.cc
             level_meter.cc
-	    gui.cc
-	    knob.cc
-	    layout.cc
-	    menu.cc
-	    mix.cc
-	    scale.cc
-	    splash.cc
-	    track_mix.cc
-	    utils.cc
+            gui.cc
+            knob.cc
+            layout.cc
+            menu.cc
+            mix.cc
+            scale.cc
+            splash.cc
+            track_mix.cc
+            utils.cc
     '''
     obj.export_includes = ['.']
     obj.defines      = [ 'PACKAGE="ardour_push2"' ]