diff --git a/pages/api/sign-in.js b/pages/api/sign-in.js
index d5309904..4615cf88 100644
--- a/pages/api/sign-in.js
+++ b/pages/api/sign-in.js
@@ -23,7 +23,9 @@ export default async (req, res) => {
 
   let user;
   try {
-    user = await Data.getUserByUsername({ username: req.body.data.username });
+    user = await Data.getUserByUsername({
+      username: req.body.data.username.toLowerCase(),
+    });
   } catch (e) {
     console.log(e);
   }
diff --git a/pages/api/users/create.js b/pages/api/users/create.js
index 6f989ebe..200a0760 100644
--- a/pages/api/users/create.js
+++ b/pages/api/users/create.js
@@ -62,7 +62,7 @@ export default async (req, res) => {
   const user = await Data.createUser({
     password: triple,
     salt,
-    username: req.body.data.username,
+    username: req.body.data.username.toLowerCase(),
     data: {
       photo: "https://slate.host/static/a1.jpg",
       settings_deals_auto_approve: false,
diff --git a/scenes/SceneSignIn.js b/scenes/SceneSignIn.js
index 6b1cb248..e678f355 100644
--- a/scenes/SceneSignIn.js
+++ b/scenes/SceneSignIn.js
@@ -105,7 +105,7 @@ export default class SceneSignIn extends React.Component {
     }
 
     const response = await this.props.onAuthenticate({
-      username: this.state.username,
+      username: this.state.username.toLowerCase(),
       password: this.state.password,
     });