diff --git a/src/PhpSpreadsheet/Style/NumberFormat/Formatter.php b/src/PhpSpreadsheet/Style/NumberFormat/Formatter.php
index 03b002e533..a2650d1cc6 100644
--- a/src/PhpSpreadsheet/Style/NumberFormat/Formatter.php
+++ b/src/PhpSpreadsheet/Style/NumberFormat/Formatter.php
@@ -114,6 +114,10 @@ public static function toFormattedString($value, $format, $callBack = null)
         }
         // For now we do not treat strings although section 4 of a format code affects strings
         if (!is_numeric($value)) {
+            if (strpos($format, ';') === false && preg_match('/@(?=(?:[^"]*"[^"]*")*[^"]*\Z)/', $format) === 1) {
+                return str_replace('"', '', preg_replace('/@(?=(?:[^"]*"[^"]*")*[^"]*\Z)/', $value, $format));
+            }
+
             return (string) $value;
         }
 
diff --git a/tests/data/Style/NumberFormat.php b/tests/data/Style/NumberFormat.php
index 4bd6b48118..9b43db345a 100644
--- a/tests/data/Style/NumberFormat.php
+++ b/tests/data/Style/NumberFormat.php
@@ -373,6 +373,27 @@
         'test',
         '_-€* #,##0.00_-;"-€"* #,##0.00_-;_-€* -??_-;_-@_-',
     ],
+    // String masks (ie. @)
+    [
+        'World',
+        'World',
+        '@',
+    ],
+    [
+        'Hello World',
+        'World',
+        'Hello @',
+    ],
+    [
+        'Hello World',
+        'World',
+        '"Hello "@',
+    ],
+    [
+        'Meet me @ The Boathouse @ 16:30',
+        'The Boathouse',
+        '"Meet me @ "@" @ 16:30"',
+    ],
     // Named colours
     // Simple color
     [