diff --git a/src/command/parser/CommandParser.ts b/src/command/parser/CommandParser.ts
index 1dcc4d0..b7317ea 100755
--- a/src/command/parser/CommandParser.ts
+++ b/src/command/parser/CommandParser.ts
@@ -95,7 +95,7 @@ export class CommandParser {
 
 		// Repeat the correct number of optional endings
 		const optional_ending: string = Array(optional_count)
-			.fill(')?')
+			.map(() => ')?')
 			.join('');
 
 		// Join the parts to a regex pattern