diff --git a/lib/Connection.js b/lib/Connection.js
index 292d854..a62efce 100644
--- a/lib/Connection.js
+++ b/lib/Connection.js
@@ -1818,8 +1818,15 @@ function validateUIDList(uids, noThrow) {
         return err;
       else
         throw err;
-    } else if (typeof uids[i] !== 'number')
+    } else if (intval <= 0) {
+      var err = new Error('UID/seqno must be greater than zero');
+      if (noThrow)
+        return err;
+      else
+        throw err;
+    } else if (typeof uids[i] !== 'number') {
       uids[i] = intval;
+    }
   }
 }