diff --git a/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TimeUnitObject.kt b/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TimeUnitObject.kt
index 233188c..3434c5a 100644
--- a/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TimeUnitObject.kt
+++ b/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TimeUnitObject.kt
@@ -556,7 +556,7 @@ fun LazyVerticalGridTUO(
         val duration by sharedScreenModel.duration.collectAsState()
         val isPlay by sharedScreenModel.isPlay.collectAsState()
         val displayedList = tuoList.drop(1)
-        val nbTotalDesRow = displayedList.size
+        val nbTotalDesRow = (displayedList.size-1)
         val activeRowIndex = if (duration > 0f) {
             ((currentPos / duration) * nbTotalDesRow).toInt().coerceIn(0, nbTotalDesRow - 1)
         } else {