diff --git a/lib/osinfo.js b/lib/osinfo.js
index 10580b0..ffd466e 100644
--- a/lib/osinfo.js
+++ b/lib/osinfo.js
@@ -198,7 +198,7 @@ function osInfo(callback) {
           });
           let releaseVersion = (release.VERSION || '').replace(/"/g, '');
           let codename = (release.DISTRIB_CODENAME || '').replace(/"/g, '');
-          if (releaseVersion.indexOf('(')) {
+          if (releaseVersion.indexOf('(') >= 0) {
             codename = releaseVersion.split('(')[1].replace(/[()]/g, '').trim();
             releaseVersion = releaseVersion.split('(')[0].trim();
           }