diff --git a/classes/bible.lua b/classes/bible.lua
index 1eb162a9f..22c50f3d9 100644
--- a/classes/bible.lua
+++ b/classes/bible.lua
@@ -6,10 +6,6 @@ local plain = require("classes.plain")
 local class = pl.class(plain)
 class._name = "bible"
 
-if not SILE.scratch.headers then
-   SILE.scratch.headers = {}
-end
-
 class.defaultFrameset = {
    content = {
       left = "8.3%pw",
diff --git a/classes/book.lua b/classes/book.lua
index 13aa4e4f9..30171827e 100644
--- a/classes/book.lua
+++ b/classes/book.lua
@@ -52,9 +52,6 @@ function class:_init (options)
       insertInto = "footnotes",
       stealFrom = { "content" },
    })
-   if not SILE.scratch.headers then
-      SILE.scratch.headers = {}
-   end
 end
 
 function class:endPage ()
diff --git a/packages/twoside/init.lua b/packages/twoside/init.lua
index e418c253e..f494f4eeb 100644
--- a/packages/twoside/init.lua
+++ b/packages/twoside/init.lua
@@ -72,6 +72,9 @@ function package:_init (options)
    end)
    self.class:registerHook("newpage", spreadHook)
    self.class:registerHook("newpage", switchPage)
+   if not SILE.scratch.headers then
+      SILE.scratch.headers = {}
+   end
 end
 
 function package:registerCommands ()