diff --git a/vector/src/main/java/im/vector/app/features/poll/PollState.kt b/vector/src/main/java/im/vector/app/features/poll/PollState.kt
index 3352c3ad05..93cdb0ecbe 100644
--- a/vector/src/main/java/im/vector/app/features/poll/PollState.kt
+++ b/vector/src/main/java/im/vector/app/features/poll/PollState.kt
@@ -16,12 +16,12 @@
 
 package im.vector.app.features.poll
 
-sealed class PollState {
-    object Sending : PollState()
-    object Ready : PollState()
-    data class Voted(val votes: Int) : PollState()
-    object Undisclosed : PollState()
-    object Ended : PollState()
+sealed interface PollState {
+    object Sending : PollState
+    object Ready : PollState
+    data class Voted(val votes: Int) : PollState
+    object Undisclosed : PollState
+    object Ended : PollState
 
     fun isVotable() = this !is Sending && this !is Ended
 }