diff --git a/src/Rules/French/Uninflected.php b/src/Rules/French/Uninflected.php
index d3bf385..1c2b99a 100644
--- a/src/Rules/French/Uninflected.php
+++ b/src/Rules/French/Uninflected.php
@@ -14,6 +14,7 @@ public static function getSingular(): iterable
         yield from self::getDefault();
 
         yield new Pattern('bois');
+        yield new Pattern('mas');
     }
 
     /** @return Pattern[] */
diff --git a/tests/Rules/French/FrenchFunctionalTest.php b/tests/Rules/French/FrenchFunctionalTest.php
index 84852d4..5f4e854 100644
--- a/tests/Rules/French/FrenchFunctionalTest.php
+++ b/tests/Rules/French/FrenchFunctionalTest.php
@@ -56,6 +56,7 @@ public function dataSampleWords(): array
             ['festival', 'festivals'],
             ['récital', 'récitals'],
             ['bois', 'bois'],
+            ['mas', 'mas'],
         ];
     }