Index: gcompris-14.07/src/tuxpaint-activity/tuxpaint.py
===================================================================
--- gcompris-14.07.orig/src/tuxpaint-activity/tuxpaint.py
+++ gcompris-14.07/src/tuxpaint-activity/tuxpaint.py
@@ -89,7 +89,7 @@ class Gcompris_tuxpaint:
     options = [progname]
 
     if (Prop.fullscreen and eval(self.config_dict['fullscreen'])):
-      options.append('--fullscreen')
+      options.append('--fullscreen=yes')
 
     if eval(self.config_dict['disable_shape_rotation']):
       options.append('--simpleshapes')
