First attempt to support class numbers from 1 to 255 - 1 is the new default class number
diff --git a/src/test/resources/queries/bsp4.jsonld b/src/test/resources/queries/bsp4.jsonld
index c5cc7db..3a0c3c4 100644
--- a/src/test/resources/queries/bsp4.jsonld
+++ b/src/test/resources/queries/bsp4.jsonld
@@ -103,7 +103,7 @@
   "query": {
     "@type": "korap:group", 
     "operation": "operation:submatch", 
-    "classRef": [0],
+    "classRef": [1],
     "operands": [
       {
         "@type": "korap:group", 
@@ -112,7 +112,7 @@
           {
             "@type": "korap:group", 
 	    "operation":"operation:class",
-            "class": 0, 
+            "class": 1, 
             "operands": [
               {
                 "@type": "korap:token",