diff --git a/_sass/_base.scss b/_sass/_base.scss
index 40a1991..2bd038a 100644
--- a/_sass/_base.scss
+++ b/_sass/_base.scss
@@ -55,7 +55,7 @@ ol,
 dl,
 figure,
 %vertical-rhythm {
-    margin-bottom: calc($spacing-unit / 2);
+    margin-bottom: calc(#{$spacing-unit} / 2);
 }
 
 
@@ -137,7 +137,7 @@ a {
 blockquote {
     color: $grey-color;
     border-left: 4px solid $grey-color-light;
-    padding-left: calc($spacing-unit / 2);
+    padding-left: calc(#{$spacing-unit} / 2);
     font-size: 18px;
     letter-spacing: -1px;
     font-style: italic;
@@ -189,8 +189,8 @@ pre {
     @include media-query($on-laptop) {
         max-width: -webkit-calc(800px - (#{$spacing-unit}));
         max-width : calc(800px - (#{$spacing-unit}));
-        padding-right: calc($spacing-unit / 2);
-        padding-left: calc($spacing-unit / 2);
+        padding-right: calc(#{$spacing-unit} / 2);
+        padding-left: calc(#{$spacing-unit} / 2);
     }
 }