diff --git a/src/app/app.py b/src/app/app.py
index 42b953ebab6465ca80d213a161cea447c026f415..f9367091b216db90228cd9db81e6f6b4d0960603 100644
--- a/src/app/app.py
+++ b/src/app/app.py
@@ -53,7 +53,7 @@ def convertUnl(unl, outputs):
 
     # Handle rdf output if any
     if 'rdf' in outputs:
-        fname = '{}/{}.rdf'.format(out_dir, out_name)
+        fname = '{}/{}.ttl'.format(out_dir, out_name)
         with open(fname, 'r') as f:
             res['rdf'] = f.read()
         try: