diff --git a/asterix-aql/src/main/javacc/AQL.jj b/asterix-aql/src/main/javacc/AQL.jj
index 33ee7dc..4d181ee 100644
--- a/asterix-aql/src/main/javacc/AQL.jj
+++ b/asterix-aql/src/main/javacc/AQL.jj
@@ -962,7 +962,7 @@
             )
           )
         {
-          properties.put(key, value);
+          properties.put(key.toUpperCase(), value);
         }
        ( 
         "," 
@@ -990,7 +990,7 @@
           ) 
         )
         {
-          properties.put(key, value);
+          properties.put(key.toUpperCase(), value);
         }
         
        )*