diff --git a/biopax-validator-web/src/main/java/org/biopax/validator/web/controller/SuggesterController.java b/biopax-validator-web/src/main/java/org/biopax/validator/web/controller/SuggesterController.java
index ae46eebc..62371d2a 100644
--- a/biopax-validator-web/src/main/java/org/biopax/validator/web/controller/SuggesterController.java
+++ b/biopax-validator-web/src/main/java/org/biopax/validator/web/controller/SuggesterController.java
@@ -29,7 +29,7 @@ public String xrefDbId(@PathVariable String db, @PathVariable String id,
     return uri;
   }
 
-  @PostMapping(value = "/xref", produces = APPLICATION_JSON_VALUE)
+  @PostMapping(value = {"/xref", "/xref/"}, produces = APPLICATION_JSON_VALUE)
   public Clue xref(@RequestBody Xref[] xrefs, HttpServletResponse response)
     throws IOException {