diff --git a/scss/_variables-dark.scss b/scss/_variables-dark.scss
index 7547d85707..2601fec889 100644
--- a/scss/_variables-dark.scss
+++ b/scss/_variables-dark.scss
@@ -63,11 +63,7 @@ $form-select-indicator-color-dark: $body-color-dark !default;
$form-select-indicator-dark: url("data:image/svg+xml,") !default;
$form-switch-color-dark: rgba($white, .25) !default;
-@if $enable-rounded {
- $form-switch-bg-image-dark: url("data:image/svg+xml,") !default;
-} @else {
- $form-switch-bg-image-dark: url("data:image/svg+xml,") !default;
-}
+$form-switch-bg-image-dark: if($enable-rounded, url("data:image/svg+xml,"), url("data:image/svg+xml,")) !default;
// scss-docs-start form-validation-colors-dark
$form-valid-color-dark: $green-300 !default;