diff --git a/web/styles/app_variables.css b/web/styles/app_variables.css
index 77359355d1..17cb31e822 100644
--- a/web/styles/app_variables.css
+++ b/web/styles/app_variables.css
@@ -250,8 +250,8 @@
     --left-sidebar-before-unread-count-padding: 3px;
     /* 15px is the approximate width of a single-digit
        unread marker. */
-    /* 15px at 16px/1em */
-    --left-sidebar-single-digit-unread-width: 0.9375em;
+    /* 15px at 8px/1em (masked unreads are sized to 0.5em) */
+    --left-sidebar-single-digit-unread-width: 1.875em;
     --left-sidebar-right-margin: 12px;
     /* 289px at 14px/1em */
     --left-sidebar-max-width: calc(