diff --git a/tools/widl/header.c b/tools/widl/header.c
index a5e5d6c6fb3..1a69b298e7d 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -872,11 +872,25 @@ static void write_generic_handle_routines(FILE *header)
 
 static void write_typedef(FILE *header, type_t *type, int declonly)
 {
-  type_t *t = type_alias_get_aliasee_type(type);
-  if (winrt_mode && t->namespace && !is_global_namespace(t->namespace)) return;
-  fprintf(header, "typedef ");
-  write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->name, NAME_DEFAULT);
-  fprintf(header, ";\n");
+    type_t *t = type_alias_get_aliasee_type(type);
+    if (winrt_mode && t->namespace && !is_global_namespace(t->namespace))
+    {
+        fprintf(header, "#ifdef __cplusplus\n");
+        write_namespace_start(header, t->namespace);
+        indent(header, 0);
+    }
+    fprintf(header, "typedef ");
+    write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->name, NAME_DEFAULT);
+    fprintf(header, ";\n");
+    if (winrt_mode && t->namespace && !is_global_namespace(t->namespace))
+    {
+        write_namespace_end(header, t->namespace);
+        fprintf(header, "#else /* __cplusplus */\n");
+        fprintf(header, "typedef ");
+        write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->c_name, NAME_C);
+        fprintf(header, ";\n");
+        fprintf(header, "#endif /* __cplusplus */\n\n");
+    }
 }
 
 int is_const_decl(const var_t *var)