diff --git a/lib/github-auth.js b/lib/github-auth.js
index aad8143fa1..642f3ae785 100644
--- a/lib/github-auth.js
+++ b/lib/github-auth.js
@@ -243,7 +243,7 @@ function githubRequest(request, url, query, cb) {
     'Accept': 'application/vnd.github.v3+json',
   };
 
-  const githubToken = globalToken === null ? getReqRemainingToken() : globalToken;
+  const githubToken = globalToken === undefined ? getReqRemainingToken() : globalToken;
 
   if (githubToken != null) {
     // Typically, GitHub user tokens grants us 12500 req/hour.