diff --git a/wp-admin/upgrade-functions.php b/wp-admin/upgrade-functions.php
index f08d55c6cb..edb033a1cc 100644
--- a/wp-admin/upgrade-functions.php
+++ b/wp-admin/upgrade-functions.php
@@ -708,7 +708,9 @@ function upgrade_110() {
 	$wpdb->query("DELETE FROM $tableoptiongroups WHERE group_id = 6");
 
 	// Add blog_charset option
-	$wpdb->query("INSERT INTO $tableoptions (option_id, option_name, option_type, option_value, option_description, option_admin_level, option_width) VALUES (93, 1, 'blog_charset', 'Y', 3, 'utf-8', 20, 8, 'your blog\'s charset (here\'s a <a href=\"http://developer.apple.com/documentation/macos8/TextIntlSvcs/TextEncodingConversionManager/TEC1.5/TEC.b0.html\">list of possible charsets</a>)', 8)");
+	if(!$wpdb->get_var("SELECT * FROM $tableoptiongroup_options WHERE option_id = '93'")) {
+			$wpdb->query("INSERT INTO $tableoptions (option_id, option_name, option_type, option_value, option_description, option_admin_level, option_width) VALUES (93, 1, 'blog_charset', 'Y', 3, 'utf-8', 20, 8, 'your blog\'s charset (here\'s a <a href=\"http://developer.apple.com/documentation/macos8/TextIntlSvcs/TextEncodingConversionManager/TEC1.5/TEC.b0.html\">list of possible charsets</a>)', 8)");
+	}
 
 }