diff --git a/opentech/static_src/src/sass/layout/_header.scss b/opentech/static_src/src/sass/layout/_header.scss
index 95a55c95c4d79c61e8957c2d4447e6b9a13f3465..3815ee28ccdb506fc52113274bb9e598c8eaa818 100644
--- a/opentech/static_src/src/sass/layout/_header.scss
+++ b/opentech/static_src/src/sass/layout/_header.scss
@@ -72,7 +72,7 @@
             background: $color--dark-grey;
             opacity: 0;
             transform: translate3d(0, -100%, 0);
-            transition: opacity, transform, 250ms cubic-bezier(0.65, 0.05, 0.36, 1) 0ms;
+            transition: opacity, transform, 250ms cubic-bezier(0.65, 0.05, 0.36, 1);
 
             &.is-visible {
                 opacity: 1;