diff --git a/src/scss/system/_variables.scss b/src/scss/system/_variables.scss
index ae28774..9f2d03c 100644
--- a/src/scss/system/_variables.scss
+++ b/src/scss/system/_variables.scss
@@ -25,6 +25,7 @@ $color: (
 );
 
 $device: (
+  xs: 375px,
   sm: 576px,
   md: 768px,
   lg: 992px,