diff --git a/backend/app/api/handlers/v1/v1_ctrl_auth.go b/backend/app/api/handlers/v1/v1_ctrl_auth.go
index 24b1654..95a5cb2 100644
--- a/backend/app/api/handlers/v1/v1_ctrl_auth.go
+++ b/backend/app/api/handlers/v1/v1_ctrl_auth.go
@@ -3,6 +3,7 @@ package v1
 import (
 	"errors"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/hay-kot/homebox/backend/internal/core/services"
@@ -70,7 +71,7 @@ func (ctrl *V1Controller) HandleAuthLogin() server.HandlerFunc {
 			)
 		}
 
-		newToken, err := ctrl.svc.User.Login(r.Context(), loginForm.Username, loginForm.Password)
+		newToken, err := ctrl.svc.User.Login(r.Context(), strings.ToLower(loginForm.Username), loginForm.Password)
 
 		if err != nil {
 			return validate.NewRequestError(errors.New("authentication failed"), http.StatusInternalServerError)
diff --git a/backend/internal/data/repo/repo_users.go b/backend/internal/data/repo/repo_users.go
index 0eaa127..28407f1 100644
--- a/backend/internal/data/repo/repo_users.go
+++ b/backend/internal/data/repo/repo_users.go
@@ -69,7 +69,7 @@ func (e *UserRepository) GetOneId(ctx context.Context, id uuid.UUID) (UserOut, e
 
 func (e *UserRepository) GetOneEmail(ctx context.Context, email string) (UserOut, error) {
 	return mapUserOutErr(e.db.User.Query().
-		Where(user.Email(email)).
+		Where(user.EmailEqualFold(email)).
 		WithGroup().
 		Only(ctx),
 	)