diff --git a/sqlitedict.py b/sqlitedict.py
index 3e65724..65186d7 100755
--- a/sqlitedict.py
+++ b/sqlitedict.py
@@ -360,7 +360,7 @@ def get_tablenames(filename):
         """get the names of the tables in an sqlite db as a list"""
         if not os.path.isfile(filename):
             raise IOError('file %s does not exist' % (filename))
-        GET_TABLENAMES = 'SELECT name FROM sqlite_master WHERE type="table"'
+        GET_TABLENAMES = "SELECT name FROM sqlite_master WHERE type='table'"
         with sqlite3.connect(filename) as conn:
             cursor = conn.execute(GET_TABLENAMES)
             res = cursor.fetchall()