diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 76013c934e..00480d6848 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2174,7 +2174,7 @@ function wp_get_mime_types() {
 	'gif' => 'image/gif',
 	'png' => 'image/png',
 	'bmp' => 'image/bmp',
-	'tif|tiff' => 'image/tiff',
+	'tiff|tif' => 'image/tiff',
 	'ico' => 'image/x-icon',
 	// Video formats.
 	'asf|asx' => 'video/x-ms-asf',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6e4a5758e7..27c0896afc 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31043';
+$wp_version = '4.2-alpha-31044';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.