diff --git a/simple-css.php b/simple-css.php
index 09c89a5..172698c 100644
--- a/simple-css.php
+++ b/simple-css.php
@@ -58,7 +58,9 @@ function simple_css_register_setting() {
 	register_setting(
 		'simple_css',
 		'simple_css',
-		'simple_css_validate'
+		array(
+			'sanitize_callback' => 'simple_css_validate',
+		)
 	);
 }
 
@@ -299,6 +301,10 @@ function simple_css_save_metabox( $post_id ) {
 		return;
 	}
 
+	if ( ! current_user_can( 'edit_post', $post_id ) ) {
+		return;
+	}
+
 	if ( isset( $_POST[ '_simple_css' ] ) && $_POST[ '_simple_css' ] !== '' ) {
 		update_post_meta( $post_id, '_simple_css', strip_tags( $_POST[ '_simple_css' ] ) );
 	} else {