diff -ru a/tools/magpie/magpie/templates/okl/client.template.c b/tools/magpie/magpie/templates/okl/client.template.c
--- a/tools/magpie/magpie/templates/okl/client.template.c	2008-07-22 14:41:50.000000000 +0530
+++ b/tools/magpie/magpie/templates/okl/client.template.c	2008-07-05 16:07:27.000000000 +0530
@@ -133,6 +133,11 @@
 /*-if function.has_varlength_params_in()*/
 	byte *mr_varptr = mr; /* Variable-length param buffer pointer */\n
 /*fi-*/
+/*-if not function.has_varlength_params_in()*/
+	/*-if function.has_varlength_params_out()*/
+	   byte *mr_varptr = mr; /* Variable-length param buffer pointer */\n
+	/*fi-*/
+/*fi-*/
 	/* pre_ipc_defs */\n
 	L4_Word_t _asynch_mask;\n
 	\n
diff -ru a/tools/magpie/magpie/templates/okl/service_headers.template.h b/tools/magpie/magpie/templates/okl/service_headers.template.h
--- a/tools/magpie/magpie/templates/okl/service_headers.template.h	2008-07-22 14:41:50.000000000 +0530
+++ b/tools/magpie/magpie/templates/okl/service_headers.template.h	2008-07-05 16:31:27.000000000 +0530
@@ -80,12 +80,15 @@
 /*-?function.get_return_type()-*/ /*-?function_implementation_name-*/(/*-?func_signature-*/);\n
 \n
 /* Reply-only function, for callbacks. */\n
-static inline void /*-?function.get_name()-*/_reply(CORBA_Object _client/*LOOP function.get_params_out()*/, /*-?LOOPITEM['typename']-*/ /*-?LOOPITEM['indirection']-*/ /*-?LOOPITEM['c_impl_indirection']-*/ /*-?LOOPITEM['name']-*//*ENDLOOP*/ /*-if function.get_return_type() != 'void'*/, /*-?function.get_return_type()-*/ __return /*fi-*/);
+static inline void /*-?function.get_name()-*/_reply(CORBA_Object _client/*LOOP function.get_params_out()*/, /*-?LOOPITEM.c_typename-*/ /*-?LOOPITEM['name']-*//*ENDLOOP*/ /*-if function.get_return_type() != 'void'*/, /*-?function.get_return_type()-*/ __return /*fi-*/);\n
 
 static inline void\n
 /*-?function.get_name()-*/_reply(CORBA_Object _client/*LOOP function.get_params_out()*/, /*-?LOOPITEM.c_typename-*/ /*-?LOOPITEM['name']-*//*ENDLOOP*/ /*-if function.get_return_type() != 'void'*/, /*-?function.get_return_type()-*/ __return /*fi-*/)\n
 {\n
 	byte *mr = (void *)L4_MRStart();\n
+/*-if function.has_varlength_params_out()*/
+	byte *mr_varptr = mr;
+/*fi-*/
 	/* Marshal */\n
 /*LOOP cmd, args = function.marshal('out', startword = 1)*/
 	/*-run(templates.get(cmd), args = args)-*/
diff -ru a/tools/magpie/magpie/templates/okl/service.template.c b/tools/magpie/magpie/templates/okl/service.template.c
--- a/tools/magpie/magpie/templates/okl/service.template.c	2008-07-22 14:41:50.000000000 +0530
+++ b/tools/magpie/magpie/templates/okl/service.template.c	2008-07-05 16:07:02.000000000 +0530
@@ -130,6 +130,11 @@
 /*-if function.has_varlength_params_in()*/
 	byte *mr_varptr = mr; /* Variable-length param buffer pointer */\n
 /*fi-*/
+/*-if not function.has_varlength_params_in()*/
+	/*-if function.has_varlength_params_out()*/
+	   byte *mr_varptr = mr; /* Variable-length param buffer pointer */\n
+	/*fi-*/
+/*fi-*/
 	env._action = 0;\n
 \n
 	/* Unmarshal */\n