diff --git a/rhodecode/model/db.py b/rhodecode/model/db.py
--- a/rhodecode/model/db.py
+++ b/rhodecode/model/db.py
@@ -3339,6 +3339,14 @@ class _PullRequestBase(BaseModel):
     def revisions(self, val):
         self._revisions = ':'.join(val)
 
+    @hybrid_property
+    def last_merge_status(self):
+        return safe_int(self._last_merge_status)
+
+    @last_merge_status.setter
+    def last_merge_status(self, val):
+        self._last_merge_status = val
+
     @declared_attr
     def author(cls):
         return relationship('User', lazy='joined')
diff --git a/rhodecode/model/pull_request.py b/rhodecode/model/pull_request.py
--- a/rhodecode/model/pull_request.py
+++ b/rhodecode/model/pull_request.py
@@ -780,7 +780,7 @@ class PullRequestModel(BaseModel):
 
         version._last_merge_source_rev = pull_request._last_merge_source_rev
         version._last_merge_target_rev = pull_request._last_merge_target_rev
-        version._last_merge_status = pull_request._last_merge_status
+        version.last_merge_status = pull_request.last_merge_status
         version.shadow_merge_ref = pull_request.shadow_merge_ref
         version.merge_rev = pull_request.merge_rev
         version.reviewer_data = pull_request.reviewer_data
@@ -1223,9 +1223,9 @@ class PullRequestModel(BaseModel):
                 pull_request, target_vcs, target_ref)
         else:
             possible = pull_request.\
-                _last_merge_status == MergeFailureReason.NONE
+                last_merge_status == MergeFailureReason.NONE
             merge_state = MergeResponse(
-                possible, False, None, pull_request._last_merge_status)
+                possible, False, None, pull_request.last_merge_status)
 
         return merge_state
 
@@ -1258,7 +1258,7 @@ class PullRequestModel(BaseModel):
             pull_request._last_merge_source_rev = \
                 pull_request.source_ref_parts.commit_id
             pull_request._last_merge_target_rev = target_reference.commit_id
-            pull_request._last_merge_status = merge_state.failure_reason
+            pull_request.last_merge_status = merge_state.failure_reason
             pull_request.shadow_merge_ref = merge_state.merge_ref
             Session().add(pull_request)
             Session().commit()
diff --git a/rhodecode/tests/models/test_pullrequest.py b/rhodecode/tests/models/test_pullrequest.py
--- a/rhodecode/tests/models/test_pullrequest.py
+++ b/rhodecode/tests/models/test_pullrequest.py
@@ -155,7 +155,7 @@ class TestPullRequestModel(object):
 
         assert pull_request._last_merge_source_rev is None
         assert pull_request._last_merge_target_rev is None
-        assert pull_request._last_merge_status is None
+        assert pull_request.last_merge_status is None
 
         status, msg = PullRequestModel().merge_status(pull_request)
         assert status is True
@@ -168,7 +168,7 @@ class TestPullRequestModel(object):
 
         assert pull_request._last_merge_source_rev == self.source_commit
         assert pull_request._last_merge_target_rev == self.target_commit
-        assert pull_request._last_merge_status is MergeFailureReason.NONE
+        assert pull_request.last_merge_status is MergeFailureReason.NONE
 
         self.merge_mock.reset_mock()
         status, msg = PullRequestModel().merge_status(pull_request)
@@ -182,7 +182,7 @@ class TestPullRequestModel(object):
 
         assert pull_request._last_merge_source_rev is None
         assert pull_request._last_merge_target_rev is None
-        assert pull_request._last_merge_status is None
+        assert pull_request.last_merge_status is None
 
         status, msg = PullRequestModel().merge_status(pull_request)
         assert status is False
@@ -198,7 +198,7 @@ class TestPullRequestModel(object):
         assert pull_request._last_merge_source_rev == self.source_commit
         assert pull_request._last_merge_target_rev == self.target_commit
         assert (
-            pull_request._last_merge_status is MergeFailureReason.MERGE_FAILED)
+            pull_request.last_merge_status is MergeFailureReason.MERGE_FAILED)
 
         self.merge_mock.reset_mock()
         status, msg = PullRequestModel().merge_status(pull_request)
@@ -214,7 +214,7 @@ class TestPullRequestModel(object):
 
         assert pull_request._last_merge_source_rev is None
         assert pull_request._last_merge_target_rev is None
-        assert pull_request._last_merge_status is None
+        assert pull_request.last_merge_status is None
 
         status, msg = PullRequestModel().merge_status(pull_request)
         assert status is False
@@ -229,7 +229,7 @@ class TestPullRequestModel(object):
 
         assert pull_request._last_merge_source_rev is None
         assert pull_request._last_merge_target_rev is None
-        assert pull_request._last_merge_status is None
+        assert pull_request.last_merge_status is None
 
         self.merge_mock.reset_mock()
         status, msg = PullRequestModel().merge_status(pull_request)
@@ -760,7 +760,7 @@ def test_create_version_from_snapshot_up
     pull_request.status = PullRequest.STATUS_CLOSED
     pull_request._last_merge_source_rev = "0" * 40
     pull_request._last_merge_target_rev = "1" * 40
-    pull_request._last_merge_status = 1
+    pull_request.last_merge_status = 1
     pull_request.merge_rev = "2" * 40
 
     # Remember automatic values
@@ -787,7 +787,7 @@ def test_create_version_from_snapshot_up
     assert version.target_ref == pr_util.create_parameters['target_ref']
     assert version._last_merge_source_rev == pull_request._last_merge_source_rev
     assert version._last_merge_target_rev == pull_request._last_merge_target_rev
-    assert version._last_merge_status == pull_request._last_merge_status
+    assert version.last_merge_status == pull_request.last_merge_status
     assert version.merge_rev == pull_request.merge_rev
     assert version.pull_request == pull_request