diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index ed7b531..d3015e3 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -447,7 +447,7 @@ route[EXTERNAL_TO_INTERNAL_RELAY]
     }
     #!endif
 
-    remove_hf_re(“^X-.*");
+    remove_hf_re("^X-.*");
     append_hf("X-AUTH-IP: $si\r\n");
 
     t_on_reply("INTERNAL_REPLY");
@@ -564,7 +564,7 @@ failure_route[INTERNAL_FAULT]
         $sht(redirects=>$avp(AVP_REDIRECT_KEY)) = $null;
     }
 
-    remove_hf_re(“^X-.*");
+    remove_hf_re("^X-.*");
 
     # change 6xx to 4xx
     if (t_check_status("6[0-9][0-9]") && !t_check_status("600|603|604|606")) {