diff --git a/src/components/cascadeselect/CascadeSelect.d.ts b/src/components/cascadeselect/CascadeSelect.d.ts
index c26ef6da5..a12641fe3 100644
--- a/src/components/cascadeselect/CascadeSelect.d.ts
+++ b/src/components/cascadeselect/CascadeSelect.d.ts
@@ -6,7 +6,7 @@ interface CascadeSelectProps {
     optionLabel?: string;
     optionValue?: any;
     optionGroupLabel?: string;
-    optionGroupChildren?: string;
+    optionGroupChildren?: string[];
     placeholder?: string;
     disabled?: boolean;
     dataKey?: string;
diff --git a/src/views/cascadeselect/CascadeSelectDoc.vue b/src/views/cascadeselect/CascadeSelectDoc.vue
index 4f939c20b..4a26b234d 100644
--- a/src/views/cascadeselect/CascadeSelectDoc.vue
+++ b/src/views/cascadeselect/CascadeSelectDoc.vue
@@ -167,7 +167,7 @@ data() {
                     </tr>
                     <tr>
                         <td>optionGroupChildren</td>
-                        <td>string</td>
+                        <td>array</td>
                         <td>null</td>
                         <td>Property name or getter function to retrieve the items of a group.</td>
                     </tr>
@@ -609,4 +609,4 @@ img {
         }
     }
 }
-</script>
\ No newline at end of file
+</script>