diff --git a/tools/widl/header.c b/tools/widl/header.c
index defc7f85037..ef141d93481 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -1784,15 +1784,15 @@ void write_header(const statement_list_t *stmts)
   }
   fprintf(header, "/*** Autogenerated by WIDL %s from %s - Do not edit ***/\n\n", PACKAGE_VERSION, input_name);
 
+  fprintf(header, "#ifdef _WIN32\n");
   fprintf(header, "#ifndef __REQUIRED_RPCNDR_H_VERSION__\n");
   fprintf(header, "#define __REQUIRED_RPCNDR_H_VERSION__ 475\n");
-  fprintf(header, "#endif\n\n");
-
+  fprintf(header, "#endif\n");
   fprintf(header, "#include <rpc.h>\n" );
   fprintf(header, "#include <rpcndr.h>\n" );
   if (!for_each_serializable(stmts, NULL, serializable_exists))
     fprintf(header, "#include <midles.h>\n" );
-  fprintf(header, "\n" );
+  fprintf(header, "#endif\n\n");
 
   fprintf(header, "#ifndef COM_NO_WINDOWS_H\n");
   fprintf(header, "#include <windows.h>\n");