diff --git a/includes/uuid_node.features.inc b/includes/uuid_node.features.inc
index 64c5e2a..0148802 100644
--- a/includes/uuid_node.features.inc
+++ b/includes/uuid_node.features.inc
@@ -14,7 +14,7 @@ function uuid_node_features_export_options() {
   $enabled_types = array();
   $entity_info = entity_get_info('node');
   foreach ($entity_info['bundles'] as $key => $value) {
-    if (variable_get("uuid_features_entity_node_${key}", FALSE)) {
+    if (variable_get("uuid_features_entity_node_{$key}", FALSE)) {
       $enabled_types[$key] = $key;
     }
   }
diff --git a/includes/uuid_paragraphs.features.inc b/includes/uuid_paragraphs.features.inc
index bb6d319..6508486 100644
--- a/includes/uuid_paragraphs.features.inc
+++ b/includes/uuid_paragraphs.features.inc
@@ -15,7 +15,7 @@ function uuid_paragraphs_features_export_options() {
   $entity_info = entity_get_info('paragraphs_item');
   foreach ($entity_info['bundles'] as $key => $value) {
     // Only allow enabled bundles to be exported.
-    if (variable_get("uuid_features_entity_paragraphs_item_${key}", FALSE)) {
+    if (variable_get("uuid_features_entity_paragraphs_item_{$key}", FALSE)) {
       $enabled_bundles[] = $key;
     }
   }
diff --git a/includes/uuid_term.features.inc b/includes/uuid_term.features.inc
index 0a870e1..6cc48bd 100644
--- a/includes/uuid_term.features.inc
+++ b/includes/uuid_term.features.inc
@@ -15,7 +15,7 @@ function uuid_term_features_export_options() {
   $vocabs = array();
   $entity_info = entity_get_info('taxonomy_term');
   foreach ($entity_info['bundles'] as $key => $value) {
-    if (variable_get("uuid_features_entity_taxonomy_term_${key}", FALSE)) {
+    if (variable_get("uuid_features_entity_taxonomy_term_{$key}", FALSE)) {
       $vocabs[$key] = $key;
     }
   }
diff --git a/uuid_features.module b/uuid_features.module
index 7c8c35e..afd5b95 100644
--- a/uuid_features.module
+++ b/uuid_features.module
@@ -331,16 +331,16 @@ function uuid_features_settings($form, &$form_state) {
     $files = array();
     foreach ($info['bundles'] as $key => $value) {
       $options[$key] = $value['label'];
-      $entities[$key] = variable_get("uuid_features_entity_${type}_${key}", FALSE);
-      $files[$key] = variable_get("uuid_features_file_${type}_${key}", FALSE);
+      $entities[$key] = variable_get("uuid_features_entity_{$type}_{$key}", FALSE);
+      $files[$key] = variable_get("uuid_features_file_{$type}_{$key}", FALSE);
     }
-    $form['entity']["uuid_features_entity_${type}"] = array(
+    $form['entity']["uuid_features_entity_{$type}"] = array(
       '#type' => 'checkboxes',
       '#title' => t('Exportable @label bundles', array('@label' => $info['label'])),
       '#default_value' => $entities,
       '#options' => $options,
     );
-    $form['file']["uuid_features_file_${type}"] = array(
+    $form['file']["uuid_features_file_{$type}"] = array(
       '#type' => 'checkboxes',
       '#title' => t('Files exported for @label bundles', array('@label' => $info['label'])),
       '#default_value' => $files,
@@ -429,7 +429,7 @@ function uuid_features_settings_submit($form, &$form_state) {
   foreach ($form_state['values'] as $key => $value) {
     if (preg_match('/^uuid_features_(entity|file)_/', $key) && is_array($value)) {
       foreach ($value as $type => $state) {
-        variable_set("${key}_${type}", $state);
+        variable_set("{$key}_{$type}", $state);
       }
       unset($form_state['values'][$key]);
     }
@@ -448,7 +448,7 @@ function uuid_features_file_field_export(&$export, $entity_type) {
   $bundles = array();
   $entity_info = entity_get_info($entity_type);
   foreach ($entity_info['bundles'] as $key => $value) {
-    if (variable_get("uuid_features_file_${entity_type}_${key}", FALSE)) {
+    if (variable_get("uuid_features_file_{$entity_type}_{$key}", FALSE)) {
       $bundles[$key] = $key;
     }
   }