diff --git a/lib/private/image.php b/lib/private/image.php
index dc01f989d79b344808e43285814de16abc73077b..0f74bd1c565709d9453294268256e95cc033d052 100644
--- a/lib/private/image.php
+++ b/lib/private/image.php
@@ -257,6 +257,7 @@ class OC_Image implements \OCP\IImage {
 					$imageType = IMAGETYPE_XBM;
 					break;
 				case 'image/bmp':
+				case 'image/x-ms-bmp':
 					$imageType = IMAGETYPE_BMP;
 					break;
 				default: