diff --git a/glue/formats/jsonformat.py b/glue/formats/jsonformat.py
index ea32a08..11be683 100644
--- a/glue/formats/jsonformat.py
+++ b/glue/formats/jsonformat.py
@@ -57,7 +57,8 @@ def get_context(self, *args, **kwargs):
                                        'sprite_path': context['sprite_path'],
                                        'sprite_filename': context['sprite_filename'],
                                        'width': context['width'],
-                                       'height': context['height']})
+                                       'height': context['height'],
+                                       'image': context['sprite_filename']})
 
         if self.sprite.config['json_format'] == 'array':
             data['frames'] = frames.values()