diff --git a/src/scss/selectize.bootstrap3.scss b/src/scss/selectize.bootstrap3.scss
index 1dd75d401..6372982b3 100644
--- a/src/scss/selectize.bootstrap3.scss
+++ b/src/scss/selectize.bootstrap3.scss
@@ -34,7 +34,7 @@ $select-shadow-input-error-focus: inset 0 1px 1px rgba(0, 0, 0, 0.075),
 $select-border: 1px solid $input-border;
 $select-border-radius: $input-border-radius;
 
-$select-width-item-border: 0;
+$select-width-item-border: 0px;
 $select-padding-x: $padding-base-horizontal;
 $select-padding-y: $padding-base-vertical;
 $select-padding-dropdown-item-x: $padding-base-horizontal;