diff --git a/vector/src/main/java/im/vector/app/features/attachments/AttachmentTypeSelectorSharedActionViewModel.kt b/vector/src/main/java/im/vector/app/features/attachments/AttachmentTypeSelectorSharedActionViewModel.kt
index 2b85b6882a..e02b10c54b 100644
--- a/vector/src/main/java/im/vector/app/features/attachments/AttachmentTypeSelectorSharedActionViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/attachments/AttachmentTypeSelectorSharedActionViewModel.kt
@@ -23,8 +23,8 @@ import javax.inject.Inject
 class AttachmentTypeSelectorSharedActionViewModel @Inject constructor() :
         VectorSharedActionViewModel<AttachmentTypeSelectorSharedAction>()
 
-sealed class AttachmentTypeSelectorSharedAction : VectorSharedAction {
+sealed interface AttachmentTypeSelectorSharedAction : VectorSharedAction {
     data class SelectAttachmentTypeAction(
             val attachmentType: AttachmentType
-    ) : AttachmentTypeSelectorSharedAction()
+    ) : AttachmentTypeSelectorSharedAction
 }