diff --git a/wp-admin/includes/file.php b/wp-admin/includes/file.php
index 9ff24384c..b3673041c 100644
--- a/wp-admin/includes/file.php
+++ b/wp-admin/includes/file.php
@@ -79,10 +79,10 @@ function get_file_description( $file ) {
 function get_home_path() {
 	$home = get_option( 'home' );
 	$siteurl = get_option( 'siteurl' );
-	if ( $home != '' && $home != $siteurl ) {
-		$wp_path_rel_to_home = str_replace($home, '', $siteurl); /* $siteurl - $home */
-		$pos = strrpos($_SERVER["SCRIPT_FILENAME"], $wp_path_rel_to_home);
-		$home_path = substr($_SERVER["SCRIPT_FILENAME"], 0, $pos);
+	if ( ! empty( $home ) && 0 !== strcasecmp( $home, $siteurl ) ) {
+		$wp_path_rel_to_home = str_ireplace( $home, '', $siteurl ); /* $siteurl - $home */
+		$pos = strripos( str_replace( '\\', '/', $_SERVER['SCRIPT_FILENAME'] ), $wp_path_rel_to_home);
+		$home_path = substr( $_SERVER['SCRIPT_FILENAME'], 0, $pos );
 		$home_path = trailingslashit( $home_path );
 	} else {
 		$home_path = ABSPATH;