diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt
index b8de34a2..26895261 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt
@@ -343,6 +343,9 @@ class ThreadActivity : SimpleActivity() {
         confirm_manage_contacts.applyColorFilter(textColor)
         thread_add_attachment.applyColorFilter(textColor)
 
+        val adjustedPrimaryColor = getAdjustedPrimaryColor()
+        thread_messages_fastscroller.updateColors(adjustedPrimaryColor, adjustedPrimaryColor.getContrastColor())
+
         thread_character_counter.beVisibleIf(config.showCharacterCounter)
         thread_character_counter.setTextSize(TypedValue.COMPLEX_UNIT_PX, getTextSize())