diff --git a/docs/tutorial/OCamlLangImpl4.html b/docs/tutorial/OCamlLangImpl4.html
index ec3c20b..7cd54d9 100644
--- a/docs/tutorial/OCamlLangImpl4.html
+++ b/docs/tutorial/OCamlLangImpl4.html
@@ -206,6 +206,8 @@
   (* Simplify the control flow graph (deleting unreachable blocks, etc). *)
   add_cfg_simplification the_fpm;
 
+  ignore (PassManager.initialize the_fpm);
+
   (* Run the main "interpreter loop" now. *)
   Toplevel.main_loop the_fpm the_execution_engine stream;
 </pre>
@@ -992,6 +994,8 @@
   (* Simplify the control flow graph (deleting unreachable blocks, etc). *)
   add_cfg_simplification the_fpm;
 
+  ignore (PassManager.initialize the_fpm);
+
   (* Run the main "interpreter loop" now. *)
   Toplevel.main_loop the_fpm the_execution_engine stream;
 
diff --git a/docs/tutorial/OCamlLangImpl5.html b/docs/tutorial/OCamlLangImpl5.html
index 6c77e9f..bd22c5e 100644
--- a/docs/tutorial/OCamlLangImpl5.html
+++ b/docs/tutorial/OCamlLangImpl5.html
@@ -1519,6 +1519,8 @@
   (* Simplify the control flow graph (deleting unreachable blocks, etc). *)
   add_cfg_simplification the_fpm;
 
+  ignore (PassManager.initialize the_fpm);
+
   (* Run the main "interpreter loop" now. *)
   Toplevel.main_loop the_fpm the_execution_engine stream;
 
diff --git a/docs/tutorial/OCamlLangImpl6.html b/docs/tutorial/OCamlLangImpl6.html
index 8c6996f..5713188 100644
--- a/docs/tutorial/OCamlLangImpl6.html
+++ b/docs/tutorial/OCamlLangImpl6.html
@@ -1518,6 +1518,8 @@
   (* Simplify the control flow graph (deleting unreachable blocks, etc). *)
   add_cfg_simplification the_fpm;
 
+  ignore (PassManager.initialize the_fpm);
+
   (* Run the main "interpreter loop" now. *)
   Toplevel.main_loop the_fpm the_execution_engine stream;
 
diff --git a/docs/tutorial/OCamlLangImpl7.html b/docs/tutorial/OCamlLangImpl7.html
index dab3059..411e040 100644
--- a/docs/tutorial/OCamlLangImpl7.html
+++ b/docs/tutorial/OCamlLangImpl7.html
@@ -1852,6 +1852,8 @@
   (* Simplify the control flow graph (deleting unreachable blocks, etc). *)
   add_cfg_simplification the_fpm;
 
+  ignore (PassManager.initialize the_fpm);
+
   (* Run the main "interpreter loop" now. *)
   Toplevel.main_loop the_fpm the_execution_engine stream;