diff --git a/src/authorizers/github.js b/src/authorizers/github.js
index e2201e0..adf8126 100644
--- a/src/authorizers/github.js
+++ b/src/authorizers/github.js
@@ -112,7 +112,8 @@ export default async ({ methodArn, authorizationToken }, context, callback) => {
     }
 
     if (process.env.admins) {
-      isAdmin = process.env.admins.split(',').indexOf(user.login) > -1;
+      const login = user.login.toLowerCase();
+      isAdmin = process.env.admins.toLowerCase().split(',').indexOf(login) > -1;
     }
 
     const policy = generatePolicy({
diff --git a/test/authorizers/github.test.js b/test/authorizers/github.test.js
index 6259c58..c456876 100644
--- a/test/authorizers/github.test.js
+++ b/test/authorizers/github.test.js
@@ -414,7 +414,7 @@ describe('GitHub Authorizer', () => {
           authStub = stub();
           checkAuthStub = stub().returns({
             user: {
-              login: 'foo-user',
+              login: 'Foo-User',
               avatar_url: 'https://example.com',
             },
             created_at: '2001-01-01T00:00:00Z',
@@ -479,7 +479,7 @@ describe('GitHub Authorizer', () => {
             ],
           },
           context: {
-            username: 'foo-user',
+            username: 'Foo-User',
             avatar: 'https://example.com',
             createdAt: '2001-01-01T00:00:00Z',
             updatedAt: '2001-02-01T00:00:00Z',