diff --git a/client/galaxy/style/scss/history.scss b/client/galaxy/style/scss/history.scss
index 2054bd97aa4..3e0f29cad25 100644
--- a/client/galaxy/style/scss/history.scss
+++ b/client/galaxy/style/scss/history.scss
@@ -321,7 +321,7 @@
 
         // show clickable for expansion
         cursor: pointer;
-        border-bottom: 1px solid fade-out(grey, .5);
+        border-bottom: 1px solid rgba(grey, .5);
         & > * {
             display: table-cell;
             vertical-align: top;