diff --git a/application/controllers/Qso.php b/application/controllers/Qso.php
index 51f6321e..a86fdcf3 100755
--- a/application/controllers/Qso.php
+++ b/application/controllers/Qso.php
@@ -450,7 +450,7 @@ class QSO extends CI_Controller {
       // Allow empty locator
       if (preg_match('/^$/', $grid)) return true;
       // Allow 6-digit locator
-      if (preg_match('/^[A-Ra-r]{2}[0-9]{2}[A-Ra-r]{2}$/', $grid)) return true;
+      if (preg_match('/^[A-Ra-r]{2}[0-9]{2}[A-Za-z]{2}$/', $grid)) return true;
       // Allow 4-digit locator
       else if (preg_match('/^[A-Ra-r]{2}[0-9]{2}$/', $grid)) return true;
       // Allow 4-digit grid line