diff --git a/app/assets/sass/layout/_navigation.scss b/app/assets/sass/layout/_navigation.scss
index 09cb434..213f8d3 100644
--- a/app/assets/sass/layout/_navigation.scss
+++ b/app/assets/sass/layout/_navigation.scss
@@ -57,8 +57,8 @@
                     padding: $navbar-link-vertical-spacing 10px $navbar-link-vertical-spacing;
                     line-height: $line-height-computed;
 
-                    margin-left: ($navbar-link-spacing / 2);
-                    margin-right: ($navbar-link-spacing / 2);
+                    margin-left: calc($navbar-link-spacing / 2);
+                    margin-right: calc($navbar-link-spacing / 2);
 
                     &:hover {
                         color: $navbar-link-hover-color;