diff --git a/sass/grid/columns.sass b/sass/grid/columns.sass
index bdc7e3aa..965208e4 100644
--- a/sass/grid/columns.sass
+++ b/sass/grid/columns.sass
@@ -473,4 +473,4 @@ $column-gap: 0.75rem !default
     padding-right: var(--columnGap)
   @for $i from 0 through 8
     &.is-#{$i}
-      --columnGap: $i * 0.25rem
+      --columnGap: #{$i * 0.25rem}