diff --git a/ckanext/datastore/db.py b/ckanext/datastore/db.py
index 77054d73c88..002fa6f57d8 100644
--- a/ckanext/datastore/db.py
+++ b/ckanext/datastore/db.py
@@ -33,10 +33,10 @@ def __init__(self, error_dict):
 
 # See http://www.postgresql.org/docs/9.2/static/errcodes-appendix.html
 _PG_ERR_CODE = {
-    'unique_violation': 23505,
-    'query_canceled': 57014,
-    'undefined_object': 42704,
-    'syntax_error': 42601
+    'unique_violation': '23505',
+    'query_canceled': '57014',
+    'undefined_object': '42704',
+    'syntax_error': '42601'
 }
 
 _date_formats = ['%Y-%m-%d',
@@ -167,7 +167,7 @@ def _is_valid_pg_type(context, type_name):
         try:
             connection.execute('SELECT %s::regtype', type_name)
         except ProgrammingError, e:
-            if int(e.orig.pgcode) in [_PG_ERR_CODE['undefined_object'],
+            if e.orig.pgcode in [_PG_ERR_CODE['undefined_object'],
                                       _PG_ERR_CODE['syntax_error']]:
                 return False
             raise
@@ -969,7 +969,7 @@ def create(context, data_dict):
         trans.commit()
         return _unrename_json_field(data_dict)
     except IntegrityError, e:
-        if int(e.orig.pgcode) == _PG_ERR_CODE['unique_violation']:
+        if e.orig.pgcode == _PG_ERR_CODE['unique_violation']:
             raise ValidationError({
                 'constraints': ['Cannot insert records or create index because '
                                 'of uniqueness constraint'],
@@ -979,7 +979,7 @@ def create(context, data_dict):
             })
         raise
     except DBAPIError, e:
-        if int(e.orig.pgcode) == _PG_ERR_CODE['query_canceled']:
+        if e.orig.pgcode == _PG_ERR_CODE['query_canceled']:
             raise ValidationError({
                 'query': ['Query took too long']
             })
@@ -1012,7 +1012,7 @@ def upsert(context, data_dict):
         trans.commit()
         return _unrename_json_field(data_dict)
     except IntegrityError, e:
-        if int(e.orig.pgcode) == _PG_ERR_CODE['unique_violation']:
+        if e.orig.pgcode == _PG_ERR_CODE['unique_violation']:
             raise ValidationError({
                 'constraints': ['Cannot insert records or create index because '
                                 'of uniqueness constraint'],
@@ -1022,7 +1022,7 @@ def upsert(context, data_dict):
             })
         raise
     except DBAPIError, e:
-        if int(e.orig.pgcode) == _PG_ERR_CODE['query_canceled']:
+        if e.orig.pgcode == _PG_ERR_CODE['query_canceled']:
             raise ValidationError({
                 'query': ['Query took too long']
             })
@@ -1089,7 +1089,7 @@ def search(context, data_dict):
             })
         return search_data(context, data_dict)
     except DBAPIError, e:
-        if int(e.orig.pgcode) == _PG_ERR_CODE['query_canceled']:
+        if e.orig.pgcode == _PG_ERR_CODE['query_canceled']:
             raise ValidationError({
                 'query': ['Search took too long']
             })
@@ -1122,7 +1122,7 @@ def search_sql(context, data_dict):
          }
         })
     except DBAPIError, e:
-        if int(e.orig.pgcode) == _PG_ERR_CODE['query_canceled']:
+        if e.orig.pgcode == _PG_ERR_CODE['query_canceled']:
             raise ValidationError({
                 'query': ['Query took too long']
             })