diff --git a/src/modules/esl-carousel/renderers/esl-carousel.default.renderer.less b/src/modules/esl-carousel/renderers/esl-carousel.default.renderer.less
index ac8693c13..ae4268c97 100644
--- a/src/modules/esl-carousel/renderers/esl-carousel.default.renderer.less
+++ b/src/modules/esl-carousel/renderers/esl-carousel.default.renderer.less
@@ -8,9 +8,9 @@
   }
 
   &.esl-carousel-horizontal [esl-carousel-slide] {
-    width: var(--esl-slide-size);
+    width: var(--esl-slide-size, --esl-slide-fallback-size, 100%);
   }
   &.esl-carousel-vertical [esl-carousel-slide] {
-    height: var(--esl-slide-size);
+    height: var(--esl-slide-size, --esl-slide-fallback-size, 100%);
   }
 }
diff --git a/src/modules/esl-carousel/renderers/esl-carousel.grid.renderer.less b/src/modules/esl-carousel/renderers/esl-carousel.grid.renderer.less
index 44d94230f..bae421052 100644
--- a/src/modules/esl-carousel/renderers/esl-carousel.grid.renderer.less
+++ b/src/modules/esl-carousel/renderers/esl-carousel.grid.renderer.less
@@ -18,11 +18,11 @@
 
   /* stylelint-disable-next-line */
   &.esl-carousel-horizontal :is([esl-carousel-slide], [esl-carousel-fake-slide]) {
-    width: var(--esl-slide-size);
+    width: var(--esl-slide-size, --esl-slide-fallback-size, 100%);
   }
 
   /* stylelint-disable-next-line */
   &.esl-carousel-vertical :is([esl-carousel-slide], [esl-carousel-fake-slide]) {
-    height: var(--esl-slide-size);
+    height: var(--esl-slide-size, --esl-slide-fallback-size, 100%);
   }
 }