diff --git a/modules/home/mac-portable.nix b/modules/home/mac-portable.nix
index 79a3e2b..d0223fd 100644
--- a/modules/home/mac-portable.nix
+++ b/modules/home/mac-portable.nix
@@ -47,6 +47,7 @@
 
             Columns = 160;
             Rows = 45;
+            "Scrollback Lines" = 1000000;
 
             # For tmux selection and moving borders.
             "Mouse Reporting" = true;