diff --git a/codegen/src/lib.rs b/codegen/src/lib.rs
index 3763b47e..4426f173 100644
--- a/codegen/src/lib.rs
+++ b/codegen/src/lib.rs
@@ -161,7 +161,7 @@ pub fn combine_with_exported_module(args: proc_macro::TokenStream) -> proc_macro
         Err(e) => return e.to_compile_error().into(),
     };
     let tokens = quote! {
-        #module_path::rhai_generate_into_module(#module_expr);
+        #module_path::rhai_generate_into_module(#module_expr, true);
     };
     proc_macro::TokenStream::from(tokens)
 }
diff --git a/codegen/src/rhai_module.rs b/codegen/src/rhai_module.rs
index 1661df43..66f23390 100644
--- a/codegen/src/rhai_module.rs
+++ b/codegen/src/rhai_module.rs
@@ -17,7 +17,7 @@ pub(crate) fn generate_body(
     let mut set_fn_stmts: Vec<syn::Stmt> = Vec::new();
     let mut set_const_stmts: Vec<syn::Stmt> = Vec::new();
     let mut add_mod_blocks: Vec<syn::ExprBlock> = Vec::new();
-    let mut set_mod_blocks: Vec<syn::ExprBlock> = Vec::new();
+    let mut set_flattened_mod_blocks: Vec<syn::ExprBlock> = Vec::new();
     let str_type_path = syn::parse2::<syn::Path>(quote! { str }).unwrap();
 
     for (const_name, const_type, const_expr) in consts {
@@ -55,10 +55,10 @@ pub(crate) fn generate_body(
             })
             .unwrap(),
         );
-        set_mod_blocks.push(
+        set_flattened_mod_blocks.push(
             syn::parse2::<syn::ExprBlock>(quote! {
                 #(#cfg_attrs)* {
-                    self::#module_name::rhai_generate_into_module(m);
+                    self::#module_name::rhai_generate_into_module(m, flatten);
                 }
             })
             .unwrap(),
@@ -155,11 +155,6 @@ pub(crate) fn generate_body(
                     #(#add_mod_blocks)*
                 }
             }
-            pub fn rhai_generate_into_module(m: &mut Module) {
-                #(#set_fn_stmts)*
-                #(#set_const_stmts)*
-                #(#set_mod_blocks)*
-            }
         }
     })
     .unwrap();