diff --git a/src/tui/MessageFilter.zig b/src/tui/MessageFilter.zig
index d98eebf..d4ada18 100644
--- a/src/tui/MessageFilter.zig
+++ b/src/tui/MessageFilter.zig
@@ -121,7 +121,10 @@ pub const List = struct {
     }
 
     pub fn filter(self: *const List, from: tp.pid_ref, m: tp.message) error{Exit}!bool {
-        var buf: [tp.max_message_size]u8 = undefined;
+        var sfa = std.heap.stackFallback(4096, self.a);
+        const a = sfa.get();
+        const buf = a.alloc(u8, m.buf.len) catch |e| return tp.exit_error(e);
+        defer a.free(buf);
         @memcpy(buf[0..m.buf.len], m.buf);
         const m_: tp.message = .{ .buf = buf[0..m.buf.len] };
         var e: ?error{Exit} = null;