diff --git a/tailbone/api/master.py b/tailbone/api/master.py
index 2d17339e..551d6428 100644
--- a/tailbone/api/master.py
+++ b/tailbone/api/master.py
@@ -26,7 +26,6 @@ Tailbone Web API - Master View
 
 import json
 
-from rattail.config import parse_bool
 from rattail.db.util import get_fieldnames
 
 from cornice import resource, Service
@@ -185,7 +184,7 @@ class APIMasterView(APIView):
             if sortcol:
                 spec = {
                     'field': sortcol.field_name,
-                    'direction': 'asc' if parse_bool(self.request.params['ascending']) else 'desc',
+                    'direction': 'asc' if self.config.parse_bool(self.request.params['ascending']) else 'desc',
                 }
                 if sortcol.model_name:
                     spec['model'] = sortcol.model_name