diff --git a/taiga/base/utils/diff.py b/taiga/base/utils/diff.py
index e8d07e67..603c9b85 100644
--- a/taiga/base/utils/diff.py
+++ b/taiga/base/utils/diff.py
@@ -17,12 +17,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-def make_diff(first:dict, second:dict, not_found_value=None, excluded_keys:tuple=()) -> dict:
+def make_diff(first: dict, second: dict, not_found_value=None,
+              excluded_keys: tuple = ()) -> dict:
     """
     Compute a diff between two dicts.
     """
     diff = {}
-
     # Check all keys in first dict
     for key in first:
         if key not in second:
diff --git a/taiga/projects/history/freeze_impl.py b/taiga/projects/history/freeze_impl.py
index 706667ee..ae7eec7c 100644
--- a/taiga/projects/history/freeze_impl.py
+++ b/taiga/projects/history/freeze_impl.py
@@ -347,6 +347,7 @@ def userstory_freezer(us) -> dict:
         "subject": us.subject,
         "description": us.description,
         "description_html": mdrender(us.project, us.description),
+        "assigned_to": us.assigned_to_id,
         "assigned_users": [u.id for u in us.assigned_users.all()],
         "milestone": us.milestone_id,
         "client_requirement": us.client_requirement,
diff --git a/taiga/projects/history/services.py b/taiga/projects/history/services.py
index 27be7cae..ebd1bf60 100644
--- a/taiga/projects/history/services.py
+++ b/taiga/projects/history/services.py
@@ -85,6 +85,10 @@ _not_important_fields = {
     "tasks.task": frozenset(["us_order", "taskboard_order"]),
 }
 
+_deprecated_fields = {
+    "userstories.userstory": frozenset(["assigned_to"]),
+}
+
 log = logging.getLogger("taiga.history")
 
 
@@ -216,7 +220,15 @@ def is_hidden_snapshot(obj: FrozenDiff) -> bool:
     return False
 
 
-def make_diff(oldobj: FrozenObj, newobj: FrozenObj) -> FrozenDiff:
+def get_excluded_fields(typename: str) -> tuple:
+    """
+    Get excluded and deprected fields to avoid in the diff
+    """
+    return _deprecated_fields.get(typename)
+
+
+def make_diff(oldobj: FrozenObj, newobj: FrozenObj,
+              excluded_keys: tuple = ()) -> FrozenDiff:
     """
     Compute a diff between two frozen objects.
     """
@@ -229,7 +241,7 @@ def make_diff(oldobj: FrozenObj, newobj: FrozenObj) -> FrozenDiff:
     first = oldobj.snapshot
     second = newobj.snapshot
 
-    diff = make_diff_from_dicts(first, second)
+    diff = make_diff_from_dicts(first, second, None, excluded_keys)
 
     return FrozenDiff(newobj.key, diff, newobj.snapshot)
 
@@ -338,7 +350,8 @@ def take_snapshot(obj: object, *, comment: str="", user=None, delete: bool=False
         else:
             raise RuntimeError("Unexpected condition")
 
-        fdiff = make_diff(old_fobj, new_fobj)
+        excluded_fields = get_excluded_fields(typename)
+        fdiff = make_diff(old_fobj, new_fobj, excluded_fields)
 
         # If diff and comment are empty, do
         # not create empty history entry