diff --git a/assets/sass/_theme/_configuration.sass b/assets/sass/_theme/_configuration.sass
index b94b3c288593e81971eee821ca6fe63327c0e41c..774ff0f9aa4a65b774c0fe35d1ab7155ef636a97 100644
--- a/assets/sass/_theme/_configuration.sass
+++ b/assets/sass/_theme/_configuration.sass
@@ -328,7 +328,7 @@ $block-key_figures-font-size-xxl: $block-key_figures-font-size-xl !default
 $block-key_figures-number-font-size-xxl: px2rem(80) !default
 
 // Block gallery
-$block-gallery-carousel-background: $color-background-alt
+$block-gallery-carousel-background: $color-background-alt !default
 
 // Block image
 $block-image-max-height-with-sidebar: calc(100vh - var(--header-height)) !default