diff --git a/src/Scanner/FunctionsHandlersTrait.php b/src/Scanner/FunctionsHandlersTrait.php
index a31da44..4730142 100644
--- a/src/Scanner/FunctionsHandlersTrait.php
+++ b/src/Scanner/FunctionsHandlersTrait.php
@@ -140,6 +140,6 @@ abstract protected function saveTranslation(
         ?string $domain,
         ?string $context,
         string $original,
-        string $plural = null
+        ?string $plural = null
     ): ?Translation;
 }
diff --git a/src/Scanner/Scanner.php b/src/Scanner/Scanner.php
index 62a9f7c..f8267b2 100644
--- a/src/Scanner/Scanner.php
+++ b/src/Scanner/Scanner.php
@@ -51,7 +51,7 @@ protected function saveTranslation(
         ?string $domain,
         ?string $context,
         string $original,
-        string $plural = null
+        ?string $plural = null
     ): ?Translation {
         if (is_null($domain)) {
             $domain = $this->defaultDomain;