diff --git a/internal/handlers/devices.go b/internal/handlers/devices.go
index 324eace..bba28b6 100644
--- a/internal/handlers/devices.go
+++ b/internal/handlers/devices.go
@@ -208,6 +208,7 @@ func (h *DeviceHandler) CheckRegistrationStatus(c *echo.Context) error {
 
 		return c.JSON(http.StatusOK, resp)
 	}
+	pendingMu.Unlock()
 
 	return c.JSON(http.StatusOK, DeviceAuthStatusResponse{
 		Status:    "pending",