diff --git a/components/lib/image/Image.d.ts b/components/lib/image/Image.d.ts
index 0546bf671..af8c29ffc 100644
--- a/components/lib/image/Image.d.ts
+++ b/components/lib/image/Image.d.ts
@@ -232,7 +232,7 @@ export interface ImageSlots {
         /**
          * Image error function.
          */
-        onError: void;
+        onError(): void;
     }): VNode[];
     /**
      * Custom preview template.
@@ -249,7 +249,7 @@ export interface ImageSlots {
         /**
          * Preview click function.
          */
-        onClick: void;
+        onClick(): void;
     }): VNode[];
 }
 
diff --git a/components/lib/image/Image.vue b/components/lib/image/Image.vue
index 3c9be3a5e..29836875b 100644
--- a/components/lib/image/Image.vue
+++ b/components/lib/image/Image.vue
@@ -43,7 +43,7 @@
                 </div>
                 <transition name="p-image-preview" @before-enter="onBeforeEnter" @enter="onEnter" @leave="onLeave" @before-leave="onBeforeLeave" @after-leave="onAfterLeave" v-bind="ptm('transition')">
                     <div v-if="previewVisible" v-bind="ptm('previewContainer')">
-                        <slot name="preview" :style="imagePreviewStyle" :onClick="onPreviewImageClick">
+                        <slot name="preview" :class="cx('preview')" :style="imagePreviewStyle" :onClick="onPreviewImageClick">
                             <img :src="$attrs.src" :class="cx('preview')" :style="imagePreviewStyle" @click="onPreviewImageClick" v-bind="ptm('preview')" />
                         </slot>
                     </div>