diff --git a/src/chrome/browser/thorium_flag_choices.h b/src/chrome/browser/thorium_flag_choices.h
index 2813f133..6c17a826 100644
--- a/src/chrome/browser/thorium_flag_choices.h
+++ b/src/chrome/browser/thorium_flag_choices.h
@@ -13,6 +13,9 @@ const FeatureEntry::Choice kCustomTabWidthChoices[] = {
     {"120",
      "custom-tab-width",
      "120"},
+    {"180",
+     "custom-tab-width",
+     "180"},
     {"240",
      "custom-tab-width",
      "240"},