diff --git a/src/runtime/components/typo3/content/helper/T3Form/elements/T3FormElementFileUpload.global.vue b/src/runtime/components/typo3/content/helper/T3Form/elements/T3FormElementFileUpload.global.vue
index 5df8cf5..e691b2b 100644
--- a/src/runtime/components/typo3/content/helper/T3Form/elements/T3FormElementFileUpload.global.vue
+++ b/src/runtime/components/typo3/content/helper/T3Form/elements/T3FormElementFileUpload.global.vue
@@ -2,7 +2,7 @@
     <T3FileUpload
         :disabled="loading"
         :mime-types="formElement.properties?.allowedMimeTypes"
-        :multiple="formElement.properties?.multiple"
+        :multiple="!!formElement.properties?.multiple"
         :name="formElement.name"
         :placeholder="placeholder"
         :required="required"
diff --git a/src/runtime/models/typo3/content/data/form/formElement.ts b/src/runtime/models/typo3/content/data/form/formElement.ts
index daf1cfc..fe337b0 100644
--- a/src/runtime/models/typo3/content/data/form/formElement.ts
+++ b/src/runtime/models/typo3/content/data/form/formElement.ts
@@ -40,7 +40,7 @@ export interface Validator {
 export interface Properties {
     allowedMimeTypes?: string[]
     elementDescription?: string
-    multiple?: boolean
+    multiple?: true | ''
     options?: { [key: string]: string }
     placeholder?: string
     prependOptionLabel?: string