diff --git a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomReactionsStateTest.kt b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomReactionsStateTest.kt
index 7a894efa85..684d38356a 100644
--- a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomReactionsStateTest.kt
+++ b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomReactionsStateTest.kt
@@ -37,7 +37,7 @@ class RoomReactionsStateTest {
         to: String?,
         content: String,
         createdAt: Long,
-        id: String = "%064x".format(nextEventId++),
+        id: String = (nextEventId++).toString(16).padStart(64, '0'),
     ): ReactionEvent {
         val tags =
             buildList<Array<String>> {
diff --git a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomZapsStateTest.kt b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomZapsStateTest.kt
index eea3ffcd04..bc67bc0981 100644
--- a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomZapsStateTest.kt
+++ b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/RoomZapsStateTest.kt
@@ -45,7 +45,7 @@ class RoomZapsStateTest {
         from: String,
         to: String?,
         createdAt: Long,
-        id: String = "%064x".format(nextEventId++),
+        id: String = (nextEventId++).toString(16).padStart(64, '0'),
     ): LnZapEvent {
         val tags =
             buildList<Array<String>> {