diff --git a/flask_recaptcha.py b/flask_recaptcha.py
index d2c2648..2fb4700 100644
--- a/flask_recaptcha.py
+++ b/flask_recaptcha.py
@@ -64,7 +64,7 @@ def get_code(self):
         :return:
         """
         return "" if not self.is_enabled else ("""
-        <script src='//www.google.com/recaptcha/api.js'></script>
+        <script src='//www.google.com/recaptcha/api.js' async defer></script>
         <div class="g-recaptcha" data-sitekey="{SITE_KEY}" data-theme="{THEME}" data-type="{TYPE}" data-size="{SIZE}"\
          data-tabindex="{TABINDEX}"></div>
         """.format(SITE_KEY=self.site_key, THEME=self.theme, TYPE=self.type, SIZE=self.size, TABINDEX=self.tabindex))