diff --git a/src/main.ts b/src/main.ts
index 8d9ad1d..44b5a7f 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -183,6 +183,7 @@ export function printParseErrorCode(code: ParseErrorCode) {
 		case ParseErrorCode.InvalidEscapeCharacter: return 'InvalidEscapeCharacter';
 		case ParseErrorCode.InvalidCharacter: return 'InvalidCharacter';
 	}
+	return '<unknown ParseErrorCode>';
 }
 
 export type NodeType = 'object' | 'array' | 'property' | 'string' | 'number' | 'boolean' | 'null';