diff --git a/test/swftests/DictCall.as b/test/swftests/DictCall.as
index 236efd8482..c2d174cc2e 100644
--- a/test/swftests/DictCall.as
+++ b/test/swftests/DictCall.as
@@ -4,7 +4,7 @@
 package {
 public class DictCall {
     public static function main(d:Object):int{
-    	return d.x + d.y;
+        return d.x + d.y;
     }
 }
 }
diff --git a/youtube_dl/swfinterp.py b/youtube_dl/swfinterp.py
index 7c0ee1e61a..58da6c586f 100644
--- a/youtube_dl/swfinterp.py
+++ b/youtube_dl/swfinterp.py
@@ -564,7 +564,7 @@ def resfunc(args):
                     elif isinstance(pname, compat_str):  # Member access
                         obj = stack.pop()
                         assert isinstance(obj, (dict, _ScopeDict)), \
-                            'Accessing member on %r' % obj
+                            'Accessing member %r on %r' % (pname, obj)
                         stack.append(obj[pname])
                     else:  # Assume attribute access
                         idx = stack.pop()