diff --git a/demo-shell-ng2/app/theme.scss b/demo-shell-ng2/app/theme.scss
index 3191a1b844..f1455173a4 100644
--- a/demo-shell-ng2/app/theme.scss
+++ b/demo-shell-ng2/app/theme.scss
@@ -1,6 +1,6 @@
 @import '~@angular/material/theming';
-@import 'colors';
-@import 'all-theme';
+@import '_colors';
+@import '_all-theme';
 
 @include mat-core();