diff --git a/_sass/misc/article-menu.scss b/_sass/misc/article-menu.scss
index 418b4f372cd..1d5fe9484a2 100644
--- a/_sass/misc/article-menu.scss
+++ b/_sass/misc/article-menu.scss
@@ -16,7 +16,7 @@
   .post-menu-content {
     ul {
       border-left: 1px solid #e9ecef;
-      $indent: $base-font-size / 4;
+      $indent: calc($base-font-size / 4);
       $active-bgcolor: #ecebec;
 
       @for $i from 2 to 7 {
diff --git a/_sass/yat.scss b/_sass/yat.scss
index 3bbc2128b36..36f2dd2f1cf 100644
--- a/_sass/yat.scss
+++ b/_sass/yat.scss
@@ -43,8 +43,8 @@ $on-laptop:        800px !default;
 // Use media queries like this:
 // @include media-query($on-palm) {
 //   .wrapper {
-//     padding-right: $spacing-unit / 2;
-//     padding-left: $spacing-unit / 2;
+//     padding-right: calc($spacing-unit / 2);
+//     padding-left: calc($spacing-unit / 2);
 //   }
 // }
 @mixin media-query($device) {
diff --git a/_sass/yat/_base.scss b/_sass/yat/_base.scss
index cb83d82b81c..8fee7be578a 100644
--- a/_sass/yat/_base.scss
+++ b/_sass/yat/_base.scss
@@ -42,7 +42,7 @@ h1, h2, h3, h4, h5, h6,
 p, blockquote, pre,
 ul, ol, dl, figure,
 %vertical-rhythm {
-  margin-bottom: $spacing-unit / 2;
+  margin-bottom: calc($spacing-unit / 2);
 }
 
 
@@ -128,7 +128,7 @@ a {
 blockquote {
   color: $grey-color;
   border-left: 4px solid $grey-color-light;
-  padding-left: $spacing-unit / 2;
+  padding-left: calc($spacing-unit / 2);
   @include relative-font-size(1.125);
   letter-spacing: -1px;
   font-style: italic;
@@ -222,7 +222,7 @@ table {
   }
 
   th, td {
-    padding: ($spacing-unit / 3) ($spacing-unit / 2);
+    padding: calc($spacing-unit / 3) calc($spacing-unit / 2);
   }
 
   th {
diff --git a/_sass/yat/_layout.scss b/_sass/yat/_layout.scss
index 8f55e5e2a3f..772d4af5af3 100644
--- a/_sass/yat/_layout.scss
+++ b/_sass/yat/_layout.scss
@@ -107,7 +107,7 @@ html {
 
     .site-favicon {
       display: inline-block;
-      height: $header-height / 1.5;
+      height: calc($header-height / 1.5);
       margin-right: 5px;
     }
   }
@@ -695,7 +695,7 @@ html {
   }
 
   @include media-query($on-palm) {
-    height: $banner-height / 1.5;
+    height: calc($banner-height / 1.5);
   }
 }