diff --git a/css/AdminLTE.css b/css/AdminLTE.css
index 19e31865f..57c9776b0 100755
--- a/css/AdminLTE.css
+++ b/css/AdminLTE.css
@@ -1042,7 +1042,7 @@ body > .header .logo .icon {
   color: #666666;
 }
 /* Add fade animation to dropdown menus */
-.open > .dropdown-menu {
+.open:not(.dropup) > .dropdown-menu {
   animation-name: fadeAnimation;
   animation-duration: .7s;
   animation-iteration-count: 1;