diff --git a/_sass/_layout.scss b/_sass/_layout.scss
index fce9eba..61bb8c5 100644
--- a/_sass/_layout.scss
+++ b/_sass/_layout.scss
@@ -98,7 +98,7 @@
 
 .footer-heading {
     font-size: 18px;
-    margin-bottom: calc($spacing-unit / 2);
+    margin-bottom: calc(#{$spacing-unit} / 2);
 }
 
 .contact-list,
@@ -110,14 +110,14 @@
 .footer-col-wrapper {
     font-size: 15px;
     color: $grey-color;
-    margin-left: calc(-1 * $spacing-unit / 2);
+    margin-left: calc(-1 * #{$spacing-unit} / 2);
     @extend %clearfix;
 }
 
 .footer-col {
     float: left;
-    margin-bottom: calc($spacing-unit / 2);
-    padding-left: calc($spacing-unit / 2);
+    margin-bottom: calc(#{$spacing-unit} / 2);
+    padding-left: calc(#{$spacing-unit} / 2);
 }
 
 .footer-col-1 {