diff --git a/core/css/header.css b/core/css/header.css
index 5c4893fae474..fba800a1b6e1 100644
--- a/core/css/header.css
+++ b/core/css/header.css
@@ -107,8 +107,9 @@
 }
 
 #header .header-appname-container {
-	display: -webkit-flex; // @TODO: Remove if Chrome 18 support is dropped
-	display: -moz-box;     // @TODO: Remove if FF 14 support is dropped
+	display: -webkit-flex; /* @TODO: Remove if Chrome 18 support is dropped */
+	display: -ms-flexbox;  /* @TODO: Remove if IE 11 support is dropped */
+	display: -moz-box;     /* @TODO: Remove if FF 14 support is dropped */
 	display: flex;
 	position: absolute;
 	left: 15px;