diff --git a/scss/layout/_navbar.scss b/scss/layout/_navbar.scss
index 41d1dfc87..5a7b67d82 100644
--- a/scss/layout/_navbar.scss
+++ b/scss/layout/_navbar.scss
@@ -133,6 +133,10 @@ Navbar
   align-items: stretch;
   min-height: $navbar-height;
 
+  .navbar-collapse & {
+    flex-grow: 1;
+  }
+
   &.collapsing {
     min-height: 0;
   }