diff --git a/config/reasoner/dl2op/main/phone_number.n3 b/config/reasoner/dl2op/main/phone_number.n3
index b6a7a2d..e04eb47 100644
--- a/config/reasoner/dl2op/main/phone_number.n3
+++ b/config/reasoner/dl2op/main/phone_number.n3
@@ -24,11 +24,11 @@ PREFIX schema: <http://schema.org/>
   ( "tel:" ?result ) string:concatenation ?parsed_result .
  
   {
-    :s schema:telephone ?number.
+    ?s schema:telephone ?number.
   } e:becomes {
-    :s schema:telephone ?parsed_result .
+    ?s schema:telephone ?parsed_result .
   }.
 
 } => {
-  :s schema:telephone ?parsed_result .
+  ?s schema:telephone ?parsed_result .
 }.