diff --git a/src/runtime/components/layout/Card.vue b/src/runtime/components/layout/Card.vue
index b0d9c5e7c5..b05e9a48fd 100644
--- a/src/runtime/components/layout/Card.vue
+++ b/src/runtime/components/layout/Card.vue
@@ -97,7 +97,7 @@ const cardClass = computed(() => {
   return classNames(
     props.baseClass,
     props.padded && props.rounded && props.roundedClass,
-    !props.padded && props.rounded && `sm:${props.roundedClass}`,
+    !props.padded && props.rounded && props.roundedClass && `sm:${props.roundedClass}`,
     props.ringClass,
     props.shadowClass,
     props.backgroundClass,