diff --git a/lib/ansible/modules/database/mysql/mysql_user.py b/lib/ansible/modules/database/mysql/mysql_user.py
index 96d4d02161..1b8be880cd 100644
--- a/lib/ansible/modules/database/mysql/mysql_user.py
+++ b/lib/ansible/modules/database/mysql/mysql_user.py
@@ -393,7 +393,7 @@ def main():
     login_password = module.params["login_password"]
     user = module.params["user"]
     password = module.params["password"]
-    host = module.params["host"]
+    host = module.params["host"].lower()
     state = module.params["state"]
     priv = module.params["priv"]
     check_implicit_admin = module.params['check_implicit_admin']