diff --git a/packages/stream_chat_flutter/lib/src/stream_chat_theme.dart b/packages/stream_chat_flutter/lib/src/stream_chat_theme.dart
index 51bbede8..ee941222 100644
--- a/packages/stream_chat_flutter/lib/src/stream_chat_theme.dart
+++ b/packages/stream_chat_flutter/lib/src/stream_chat_theme.dart
@@ -1802,7 +1802,7 @@ class MessageListViewThemeData with Diagnosticable {
     double t,
   ) =>
       MessageListViewThemeData(
-          backgroundColor: Color.lerp(a.backgroundColor, a.backgroundColor, t));
+          backgroundColor: Color.lerp(a.backgroundColor, b.backgroundColor, t));
 
   /// Merges one [MessageListViewThemeData] with another.
   MessageListViewThemeData merge(MessageListViewThemeData? other) {