diff --git a/src/Configurator/Helpers/FilterSyntaxMatcher.php b/src/Configurator/Helpers/FilterSyntaxMatcher.php
index 85b4259a5..b5b4a0bbd 100644
--- a/src/Configurator/Helpers/FilterSyntaxMatcher.php
+++ b/src/Configurator/Helpers/FilterSyntaxMatcher.php
@@ -185,7 +185,7 @@ public function parseFilterCallback(string $callback, ?string $args = null): arr
 		return $config;
 	}
 
-	public function parseFilterArg(string $argName = null, string $argValue = null): array
+	public function parseFilterArg(string $argName, string $argValue): array
 	{
 		$arg = (str_starts_with($argValue, '$'))
 		     ? ['Name',  substr($argValue, 1)                       ]