diff --git a/taxonomy_machine_name.module b/taxonomy_machine_name.module
index e297720a6834ba80ee98d378d2b8e32f35175468..e56d9dd9beb1e97239051a95421afeee5b3c9edc 100644
--- a/taxonomy_machine_name.module
+++ b/taxonomy_machine_name.module
@@ -180,7 +180,7 @@ function taxonomy_machine_name_clean_name($name, $force = FALSE) {
     }
   }
   else {
-    $machine_name = $name;
+    $machine_name = trim(drupal_strtolower($name));
   }
 
   drupal_alter('taxonomy_machine_name_clean_name', $machine_name, $name, $force);