diff --git a/mxmount b/mxmount
index 6a24eec..3cb1b66 100755
--- a/mxmount
+++ b/mxmount
@@ -68,6 +68,10 @@ sub add_data0_if_not_present {
         if ($mp->{label} eq "data0") {
             return;
         }
+        if ($mp->{mountpoint} eq "$V{DEFAULT_MOUNT_PREFIX}/$hostname/0") {
+            print STDERR "$mp->{mountpoint} already blocked by $mp->{label}\n";
+            return;
+        }
     }
 
     #   print "no data0 found\n";