diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index f9aa67b308..b7a95fb850 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -1240,7 +1240,7 @@ function get_media_item( $attachment_id, $args = null ) {
 
 	$thumbnail = '';
 	if ( 'image' == $type && current_theme_supports( 'post-images' ) && get_post_image_id($_GET['post_id']) != $attachment_id )
-		$thumbnail = "<a class='wp-post-thumbnail' href='#' onclick='WPSetAsThumbnail(\"$attachment_id\");return false;'>" . esc_html__( "Use as thumbnail" ) . "</a>";
+		$thumbnail = "<a class='wp-post-thumbnail' href='#' onclick='WPSetAsThumbnail(\"$attachment_id\");return false;'>" . esc_html__( "Use as post image" ) . "</a>";
 
 	if ( ( $send || $thumbnail || $delete ) && !isset($form_fields['buttons']) )
 		$form_fields['buttons'] = array('tr' => "\t\t<tr class='submit'><td></td><td class='savesend'>$send $thumbnail $delete</td></tr>\n");
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 157d00f8f2..af1a9b839d 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -385,7 +385,7 @@ function wp_default_scripts( &$scripts ) {
 		$scripts->add( 'set-post-thumbnail', "/wp-admin/js/set-post-thumbnail$suffix.js", array( 'jquery' ), '20091021' );
 		$scripts->add_data( 'set-post-thumbnail', 'group', 1 );
 		$scripts->localize( 'set-post-thumbnail', 'setPostThumbnailL10n', array(
-			'setThumbnail' => __( 'Use as thumbnail' ),
+			'setThumbnail' => __( 'Use as post image' ),
 			'saving' => __( 'Saving...' ),
 			'error' => __( 'Could not set that as the thumbnail image. Try a different attachment.' )
 		) );