diff --git a/scrapy/loader/processors.py b/scrapy/loader/processors.py
index 4b6d8624c..468aec2cc 100644
--- a/scrapy/loader/processors.py
+++ b/scrapy/loader/processors.py
@@ -28,12 +28,10 @@ class MapCompose(object):
                 try:
                     next_values += arg_to_iter(func(v))
                 except Exception as e:
-                    type_name = type(func).__name__
-                    _name = (func.__name__ if type_name == 'function'
-                             else type_name)
                     raise ValueError("Error in MapCompose with "
-                                     "function %s value=%r error='%s: %s'" %
-                                     (_name, value, type(e).__name__, str(e)))
+                                     "%s value=%r error='%s: %s'" %
+                                     (str(func), value, type(e).__name__,
+                                      str(e)))
             values = next_values
         return values
 
@@ -57,12 +55,9 @@ class Compose(object):
             try:
                 value = func(value)
             except Exception as e:
-                type_name = type(func).__name__
-                _name = (func.__name__ if type_name == 'function' 
-                         else type_name)
                 raise ValueError("Error in Compose with "
-                                 "function %s value=%r error='%s: %s'" %
-                                 (_name, value, type(e).__name__, str(e)))
+                                 "%s value=%r error='%s: %s'" %
+                                 (str(func), value, type(e).__name__, str(e)))
         return value