diff --git a/plugins/modules/mysql_variables.py b/plugins/modules/mysql_variables.py
index dc54c82..f404d5a 100644
--- a/plugins/modules/mysql_variables.py
+++ b/plugins/modules/mysql_variables.py
@@ -199,7 +199,7 @@ def main():
 
     if mysqlvar is None:
         module.fail_json(msg="Cannot run without variable to operate with")
-    if match('^[0-9a-z_.]+$', mysqlvar) is None:
+    if match('^[0-9A-Za-z_.]+$', mysqlvar) is None:
         module.fail_json(msg="invalid variable name \"%s\"" % mysqlvar)
     if mysql_driver is None:
         module.fail_json(msg=mysql_driver_fail_msg)