diff --git a/src/main/resources/static/service-info.json b/src/main/resources/static/service-info.json
index 5b1ae09..2c1b15f 100644
--- a/src/main/resources/static/service-info.json
+++ b/src/main/resources/static/service-info.json
@@ -25,7 +25,7 @@
           "description": "Number of elements, such as nucleotides or amino acids, in each sequence.",
           "collated": "true",
           "items":{
-            "type": "string"
+            "type": "integer"
           }
         },
         "names":{