diff --git a/ckan/migration/versions/067_turn_extras_to_strings.py b/ckan/migration/versions/067_turn_extras_to_strings.py
index 8d2154d307a..5d4b609e01d 100644
--- a/ckan/migration/versions/067_turn_extras_to_strings.py
+++ b/ckan/migration/versions/067_turn_extras_to_strings.py
@@ -1,66 +1,28 @@
+import json
 
 def upgrade(migrate_engine):
 
-    replace_string =    "replace("*39 + r"""value,
-                        '\/', '/'),
-                        '\"', '"'),
-                        '\f', E'\f'),
-                        '\t', E'\t'),
-                        '\n', E'\n'),
-                        '\r', E'\r'),
-                        '\b', E'\b'),
-                        '\u0001', E'\x01'),
-                        '\u0002', E'\x02'),
-                        '\u0003', E'\x03'),
-                        '\u0004', E'\x04'),
-                        '\u0005', E'\x05'),
-                        '\u0006', E'\x06'),
-                        '\u0007', E'\x07'),
-                        '\u0008', E'\x08'),
-                        '\u0009', E'\x09'),
-                        '\u000a', E'\x0a'),
-                        '\u000b', E'\x0b'),
-                        '\u000c', E'\x0c'),
-                        '\u000d', E'\x0d'),
-                        '\u000e', E'\x0e'),
-                        '\u000f', E'\x0f'),
-                        '\u0010', E'\x10'),
-                        '\u0011', E'\x11'),
-                        '\u0012', E'\x12'),
-                        '\u0013', E'\x13'),
-                        '\u0014', E'\x14'),
-                        '\u0015', E'\x15'),
-                        '\u0016', E'\x16'),
-                        '\u0017', E'\x17'),
-                        '\u0018', E'\x18'),
-                        '\u0019', E'\x19'),
-                        '\u001a', E'\x1a'),
-                        '\u001b', E'\x1b'),
-                        '\u001c', E'\x1c'),
-                        '\u001d', E'\x1d'),
-                        '\u001e', E'\x1e'),
-                        '\u001f', E'\x1f'),
-                        '\\', '\')
-                        """
+    with migrate_engine.begin() as connection:
+        tables = 'package_extra group_extra'
+        revision_tables = 'package_extra_revision group_extra_revision'
 
-    update_statement = r'''
-    BEGIN;
+        for table in tables.split():
+            sql = """select id, value from {table} where left(value,1) = '"' """.format(table=table)
+            results = connection.execute(sql)
+            for result in results:
+                id, value = result
+                update_sql = 'update {table} set value = %s where id = %s'
+                connection.execute(update_sql.format(table=table),
+                                   json.loads(value), id)
 
-    UPDATE package_extra SET value = {replace_string} where left(value,1) = '"';
-    UPDATE group_extra SET value = {replace_string} where left(value,1) = '"';
+        for table in revision_tables.split():
+            sql = """select id, revision_id, value from {table} where left(value,1) = '"' """.format(table=table)
 
-    UPDATE package_extra_revision SET value = {replace_string} where left(value,1) = '"';
-    UPDATE group_extra_revision SET value = {replace_string} where left(value,1) = '"';
+            results = connection.execute(sql)
+            for result in results:
+                id, revision_id, value = result
+                update_sql = 'update {table} set value = %s where id = %s and revision_id = %s'
+                connection.execute(update_sql.format(table=table),
+                                   json.loads(value), id, revision_id)
 
 
-    UPDATE package_extra SET value = substr(value, 2 , length(value) - 2) where left(value,1) = '"';
-    UPDATE group_extra SET value = substr(value, 2 , length(value) - 2) where left(value,1) = '"';
-
-    UPDATE package_extra_revision SET value = substr(value, 2 , length(value) - 2) where left(value,1) = '"';
-    UPDATE group_extra_revision SET value = substr(value, 2 , length(value) - 2) where left(value,1) = '"';
-
-    COMMIT;
-
-    '''.format(replace_string=replace_string)
-
-    migrate_engine.execute(update_statement)