diff --git a/compss/programming_model/bindings/python/src/pycompss/util/serialization/serializer.py b/compss/programming_model/bindings/python/src/pycompss/util/serialization/serializer.py
index d5ca9e0860..95bfd380b5 100644
--- a/compss/programming_model/bindings/python/src/pycompss/util/serialization/serializer.py
+++ b/compss/programming_model/bindings/python/src/pycompss/util/serialization/serializer.py
@@ -226,7 +226,7 @@ def serialize_to_handler(obj, handler):
         except AttributeError:
             # Bug fixed in 3.5 - issue10805
             pass
-        raise SerializerException('Cannot serialize object %s' % obj)
+        raise SerializerException('Cannot serialize object %r' % (obj,))
 
 
 @emit_event(SERIALIZE_TO_FILE_EVENT, master=False, inside=True)