diff --git a/packages/mdc-notched-outline/_mixins.scss b/packages/mdc-notched-outline/_mixins.scss
index c29df8f8c8d..8196161b37e 100644
--- a/packages/mdc-notched-outline/_mixins.scss
+++ b/packages/mdc-notched-outline/_mixins.scss
@@ -22,6 +22,7 @@
 
 @import "@material/theme/mixins";
 @import "@material/shape/mixins";
+@import "@material/shape/functions";
 @import "@material/rtl/mixins";
 @import "./variables";