diff --git a/opengraph_meta.admin.inc b/opengraph_meta.admin.inc
index 286bdf9..b32bcea 100644
--- a/opengraph_meta.admin.inc
+++ b/opengraph_meta.admin.inc
@@ -39,6 +39,13 @@ function opengraph_meta_settings_form() {
     '#description' => t('Absolute or site-relative URL to an image to use for the %tag tag for nodes which don\'t have their own images.',array('%tag' => 'og:image')),
     '#default_value' => variable_get(OPENGRAPH_META_VAR_FALLBACK_IMG, ''),
   );
+  $form['defaults'][OPENGRAPH_META_VAR_IMAGE_STYLE_DEFAULT] = array(
+    '#title' => t('Default image style'),
+    '#type' => 'select',
+    '#options' => image_style_options(FALSE),
+    '#description' => t('Select a default image style for the %tag tag.',array('%tag' => 'og:image')),
+    '#default_value' => variable_get(OPENGRAPH_META_VAR_IMAGE_STYLE_DEFAULT, ''),
+  );
   $form['defaults']['types'] = array(
     '#type' => 'fieldset',
     '#title' => t('Mapping content type to meta type'),
@@ -145,6 +152,7 @@ function opengraph_meta_settings_form_submit($form, &$form_state) {
   // save other vars
   variable_set(OPENGRAPH_META_VAR_SITE_NAME, $values[OPENGRAPH_META_VAR_SITE_NAME]);
   variable_set(OPENGRAPH_META_VAR_FALLBACK_IMG, $values[OPENGRAPH_META_VAR_FALLBACK_IMG]);
+  variable_set(OPENGRAPH_META_VAR_IMAGE_STYLE_DEFAULT, $values[OPENGRAPH_META_VAR_IMAGE_STYLE_DEFAULT]);
 
   // save optional tags
   $options = array();
diff --git a/opengraph_meta.common.inc b/opengraph_meta.common.inc
index 491e401..ac29ad3 100644
--- a/opengraph_meta.common.inc
+++ b/opengraph_meta.common.inc
@@ -10,6 +10,7 @@ define('OPENGRAPH_META_VAR_CONTENT_TYPE_', 'opengraph_meta_type_');
 define('OPENGRAPH_META_VAR_CONTENT_TYPE_CCK_', 'opengraph_meta_cck_');
 define('OPENGRAPH_META_VAR_SITE_NAME', 'opengraph_meta_site_name');
 define('OPENGRAPH_META_VAR_FALLBACK_IMG', 'opengraph_meta_fallback_img');
+define('OPENGRAPH_META_VAR_IMAGE_STYLE_DEFAULT', 'opengraph_meta_image_style_default');
 
 define('OPENGRAPH_META_VAR_OPTIONAL_TAGS', 'opengraph_meta_optional_tags');
 
@@ -555,7 +556,7 @@ class OpenGraphMetaDrupalLayer {
       if (!empty($fields['filemime']) && FALSE !== stripos($fields['filemime'], 'image') && !empty($fields[$_uri_field])) {
         $url = $fields[$_uri_field];
         if (7 <= OPENGRAPH_META_DRUPAL_VERSION)
-          $url = image_style_url('thumbnail', $fields[$_uri_field]);
+          $url = image_style_url(variable_get(OPENGRAPH_META_VAR_IMAGE_STYLE_DEFAULT, 'thumbnail'), $fields[$_uri_field]);
 
         array_push($resultarray, array(
           'title' => !empty($fields['title']) ? $fields['title'] : $url,