diff --git a/lib/private/helper.php b/lib/private/helper.php
index 4c2f1f509c..b7938416fb 100644
--- a/lib/private/helper.php
+++ b/lib/private/helper.php
@@ -54,77 +54,7 @@ class OC_Helper {
 	private static $mimetypeDetector;
 	private static $templateManager;
 	/** @var string[] */
-	private static $mimeTypeAlias = array(
-		'application/octet-stream' => 'file', // use file icon as fallback
-
-		'application/illustrator' => 'image/vector',
-		'application/postscript' => 'image/vector',
-		'image/svg+xml' => 'image/vector',
-
-		'application/coreldraw' => 'image',
-		'application/x-gimp' => 'image',
-		'application/x-photoshop' => 'image',
-		'application/x-dcraw' => 'image',
-
-		'application/font-sfnt' => 'font',
-		'application/x-font' => 'font',
-		'application/font-woff' => 'font',
-		'application/vnd.ms-fontobject' => 'font',
-
-		'application/json' => 'text/code',
-		'application/x-perl' => 'text/code',
-		'application/x-php' => 'text/code',
-		'text/x-shellscript' => 'text/code',
-		'application/yaml' => 'text/code',
-		'application/xml' => 'text/html',
-		'text/css' => 'text/code',
-		'application/x-tex' => 'text',
-
-		'application/x-compressed' => 'package/x-generic',
-		'application/x-7z-compressed' => 'package/x-generic',
-		'application/x-deb' => 'package/x-generic',
-		'application/x-gzip' => 'package/x-generic',
-		'application/x-rar-compressed' => 'package/x-generic',
-		'application/x-tar' => 'package/x-generic',
-		'application/vnd.android.package-archive' => 'package/x-generic',
-		'application/zip' => 'package/x-generic',
-
-		'application/msword' => 'x-office/document',
-		'application/vnd.openxmlformats-officedocument.wordprocessingml.document' => 'x-office/document',
-		'application/vnd.openxmlformats-officedocument.wordprocessingml.template' => 'x-office/document',
-		'application/vnd.ms-word.document.macroEnabled.12' => 'x-office/document',
-		'application/vnd.ms-word.template.macroEnabled.12' => 'x-office/document',
-		'application/vnd.oasis.opendocument.text' => 'x-office/document',
-		'application/vnd.oasis.opendocument.text-template' => 'x-office/document',
-		'application/vnd.oasis.opendocument.text-web' => 'x-office/document',
-		'application/vnd.oasis.opendocument.text-master' => 'x-office/document',
-
-		'application/mspowerpoint' => 'x-office/presentation',
-		'application/vnd.ms-powerpoint' => 'x-office/presentation',
-		'application/vnd.openxmlformats-officedocument.presentationml.presentation' => 'x-office/presentation',
-		'application/vnd.openxmlformats-officedocument.presentationml.template' => 'x-office/presentation',
-		'application/vnd.openxmlformats-officedocument.presentationml.slideshow' => 'x-office/presentation',
-		'application/vnd.ms-powerpoint.addin.macroEnabled.12' => 'x-office/presentation',
-		'application/vnd.ms-powerpoint.presentation.macroEnabled.12' => 'x-office/presentation',
-		'application/vnd.ms-powerpoint.template.macroEnabled.12' => 'x-office/presentation',
-		'application/vnd.ms-powerpoint.slideshow.macroEnabled.12' => 'x-office/presentation',
-		'application/vnd.oasis.opendocument.presentation' => 'x-office/presentation',
-		'application/vnd.oasis.opendocument.presentation-template' => 'x-office/presentation',
-
-		'application/msexcel' => 'x-office/spreadsheet',
-		'application/vnd.ms-excel' => 'x-office/spreadsheet',
-		'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' => 'x-office/spreadsheet',
-		'application/vnd.openxmlformats-officedocument.spreadsheetml.template' => 'x-office/spreadsheet',
-		'application/vnd.ms-excel.sheet.macroEnabled.12' => 'x-office/spreadsheet',
-		'application/vnd.ms-excel.template.macroEnabled.12' => 'x-office/spreadsheet',
-		'application/vnd.ms-excel.addin.macroEnabled.12' => 'x-office/spreadsheet',
-		'application/vnd.ms-excel.sheet.binary.macroEnabled.12' => 'x-office/spreadsheet',
-		'application/vnd.oasis.opendocument.spreadsheet' => 'x-office/spreadsheet',
-		'application/vnd.oasis.opendocument.spreadsheet-template' => 'x-office/spreadsheet',
-		'text/csv' => 'x-office/spreadsheet',
-
-		'application/msaccess' => 'database',
-	);
+	private static $mimeTypeAlias = [];
 
 	/**
 	 * Creates an url using a defined route
@@ -256,6 +186,12 @@ class OC_Helper {
 	 */
 	public static function mimetypeIcon($mimetype) {
 
+		// On first access load the list of mimetype aliases
+		if (empty(self::$mimeTypeAlias)) {
+			$file = file_get_contents(OC::$SERVERROOT . '/config/mimetypealiases.json');
+			self::$mimeTypeAlias = get_object_vars(json_decode($file));
+		}
+
 		if (isset(self::$mimeTypeAlias[$mimetype])) {
 			$mimetype = self::$mimeTypeAlias[$mimetype];
 		}