diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index fa6a42c7e..79f63f118 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1420,31 +1420,33 @@ function rewrite_rules($matches = '', $permalink_structure = '') {
 }
 
 function mod_rewrite_rules ($permalink_structure) {
-    $site_root = str_replace('http://', '', trim(get_settings('siteurl')));
-    $site_root = preg_replace('|([^/]*)(.*)|i', '$2', $site_root);
-    if ('/' != substr($site_root, -1)) $site_root = $site_root . '/';
+	$site_root = str_replace('http://', '', trim(get_settings('siteurl')));
+	$site_root = preg_replace('|([^/]*)(.*)|i', '$2', $site_root);
+	if ('/' != substr($site_root, -1)) $site_root = $site_root . '/';
     
-    $home_root = str_replace('http://', '', trim(get_settings('home')));
-    $home_root = preg_replace('|([^/]*)(.*)|i', '$2', $home_root);
-    if ('/' != substr($home_root, -1)) $home_root = $home_root . '/';
-    
-    $rules = "RewriteEngine On\n";
-    $rules .= "RewriteBase $home_root\n";
-    $rewrite = rewrite_rules('', $permalink_structure);
-    foreach ($rewrite as $match => $query) {
-			// Apache 1.3 does not support the reluctant (non-greedy) modifier.
-			$match = str_replace('.+?', '.+', $match);
+	$home_root = str_replace('http://', '', trim(get_settings('home')));
+	$home_root = preg_replace('|([^/]*)(.*)|i', '$2', $home_root);
+	if ('/' != substr($home_root, -1)) $home_root = $home_root . '/';
 
-        if (strstr($query, 'index.php')) {
-            $rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA]\n";
-        } else {
-            $rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA]\n";
-        }
-    }
+	$rules = "<IfModule mod_rewrite.c>\n";
+	$rules .= "RewriteEngine On\n";
+	$rules .= "RewriteBase $home_root\n";
+	$rewrite = rewrite_rules('', $permalink_structure);
+	foreach ($rewrite as $match => $query) {
+		// Apache 1.3 does not support the reluctant (non-greedy) modifier.
+		$match = str_replace('.+?', '.+', $match);
 
-    $rules = apply_filters('rewrite_rules', $rules);
+		if (strstr($query, 'index.php')) {
+			$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA]\n";
+		} else {
+			$rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA]\n";
+		}
+	}
+	$rules .= "</IfModule>\n";
 
-    return $rules;
+	$rules = apply_filters('rewrite_rules', $rules);
+
+	return $rules;
 }
 
 function get_posts($args) {