diff --git a/historic/jam/src/modules.h b/historic/jam/src/modules.h
index 8ba4094b2..f5367487c 100644
--- a/historic/jam/src/modules.h
+++ b/historic/jam/src/modules.h
@@ -6,7 +6,7 @@
 #ifndef MODULES_DWA10182001_H
 # define MODULES_DWA10182001_H
 
-struct module
+struct module_t
 {
     char* name;
     struct hash* rules;
@@ -15,13 +15,13 @@ struct module
 
 typedef struct module module; /* MSVC debugger gets confused unless this is provided */
 
-module* bindmodule( char* name );
-module* root_module();
+module_t* bindmodule( char* name );
+module_t* root_module();
 void bind_module_var( module*, char* name );
-void enter_module( module* );
-void exit_module( module* );
-void delete_module( module* );
-struct hash* demand_rules( module* );
+void enter_module( module_t* );
+void exit_module( module_t* );
+void delete_module( module_t* );
+struct hash* demand_rules( module_t* );
 
 #endif
 
diff --git a/jam_src/modules.h b/jam_src/modules.h
index 8ba4094b2..f5367487c 100644
--- a/jam_src/modules.h
+++ b/jam_src/modules.h
@@ -6,7 +6,7 @@
 #ifndef MODULES_DWA10182001_H
 # define MODULES_DWA10182001_H
 
-struct module
+struct module_t
 {
     char* name;
     struct hash* rules;
@@ -15,13 +15,13 @@ struct module
 
 typedef struct module module; /* MSVC debugger gets confused unless this is provided */
 
-module* bindmodule( char* name );
-module* root_module();
+module_t* bindmodule( char* name );
+module_t* root_module();
 void bind_module_var( module*, char* name );
-void enter_module( module* );
-void exit_module( module* );
-void delete_module( module* );
-struct hash* demand_rules( module* );
+void enter_module( module_t* );
+void exit_module( module_t* );
+void delete_module( module_t* );
+struct hash* demand_rules( module_t* );
 
 #endif