diff --git a/samples/event/event.bkl b/samples/event/event.bkl
index 6b830fbc66..ab8ee98c5a 100644
--- a/samples/event/event.bkl
+++ b/samples/event/event.bkl
@@ -5,7 +5,7 @@
 
     <exe id="event" template="wx_sample" template_append="wx_append">
         <sources> event.cpp gestures.cpp </sources>
-		<headers> gestures.h </headers>
+        <headers> gestures.h </headers>
         <wx-lib>core</wx-lib>
         <wx-lib>base</wx-lib>
     </exe>