diff --git a/xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/less/messages.less b/xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/less/messages.less
index 70b1d1b43c35..b85d9ba30e04 100644
--- a/xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/less/messages.less
+++ b/xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/less/messages.less
@@ -76,25 +76,21 @@ fieldset.xwikimessage { // Used by: Login form, Delete messages
 
 .successmessage {
   .alert-success;
-  background-color: @state-success-bg;
   border-color: @brand-success;
 }
 
 .errormessage {
   .alert-danger;
-  background-color: @state-danger-bg;
   border-color: @brand-danger;
 }
 
 .warningmessage {
   .alert-warning;
-  background-color: @state-warning-bg;
   border-color: @brand-warning;
 }
 
 .infomessage {
   .alert-info;
-  background-color: @state-info-bg;
   border-color: @brand-primary;
 }