diff --git a/projects/cadcAccessControl/src/ca/nrc/cadc/ac/json/UserRequestReader.java b/projects/cadcAccessControl/src/ca/nrc/cadc/ac/json/UserRequestReader.java
index 99578856d02b120a158e3da260980e3491f74c7c..4f246e9df6e9d07618244a51eb960b8192d8a3f2 100644
--- a/projects/cadcAccessControl/src/ca/nrc/cadc/ac/json/UserRequestReader.java
+++ b/projects/cadcAccessControl/src/ca/nrc/cadc/ac/json/UserRequestReader.java
@@ -92,7 +92,7 @@ public class UserRequestReader
     {
         if (json == null)
         {
-            throw new IllegalArgumentException("XML must not be null");
+            throw new IllegalArgumentException("JSON must not be null");
         }
         else
         {