diff --git a/src/MakeJsonCommand.php b/src/MakeJsonCommand.php
index 2f5cacd..12ba2b4 100644
--- a/src/MakeJsonCommand.php
+++ b/src/MakeJsonCommand.php
@@ -356,7 +356,7 @@ protected function build_json_files( $mapping, $base_file_name, $destination ) {
 			/** @var Translations $translations */
 
 			$hash             = md5( $file );
-			$destination_file = "${destination}/{$base_file_name}-{$hash}.json";
+			$destination_file = "{$destination}/{$base_file_name}-{$hash}.json";
 
 			$success = JedGenerator::toFile(
 				$translations,