diff --git a/lib/config.js b/lib/config.js
index 71eecf8..b0ba90a 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -31,7 +31,7 @@ module.exports = class Config {
       const ts = require('typescript');
       const tsParsedConfig = ts.readJsonConfigFile(this.tsConfig, ts.sys.readFile);
       const obj = ts.parseJsonSourceFileConfigFileContent(tsParsedConfig, ts.sys, path.dirname(this.tsConfig));
-      this.tsConfigPath = this.tsConfigPath || this.tsConfig;
+      this.tsConfigPath ||= this.tsConfig;
       this.tsConfig = obj.raw;
     }