diff --git a/cmr/netcdf_cmr_umm_s.json b/cmr/netcdf_cmr_umm_s.json
index b23672f..e26ba7e 100755
--- a/cmr/netcdf_cmr_umm_s.json
+++ b/cmr/netcdf_cmr_umm_s.json
@@ -28,7 +28,7 @@
     ],
     "Subset": {
         "VariableSubset": {
-            "AllowMultipleValues": true
+            "AllowMultipleValues": false
         }
     }
   },
@@ -79,4 +79,4 @@
         "Name": "UMM-S",
         "Version": "1.5.2"
     }
-}
\ No newline at end of file
+}