diff --git a/base-linux/include/rm_session/client.h b/base-linux/include/rm_session/client.h
index 685e287b0..c60cf07e4 100644
--- a/base-linux/include/rm_session/client.h
+++ b/base-linux/include/rm_session/client.h
@@ -32,8 +32,9 @@ namespace Genode {
 		explicit Rm_session_client(Rm_session_capability session)
 		: _cap(session) { }
 
-		Local_addr attach(Dataspace_capability ds, size_t size, off_t offset,
-		                  bool use_local_addr, Local_addr local_addr,
+		Local_addr attach(Dataspace_capability ds, size_t size = 0,
+		                  off_t offset = 0, bool use_local_addr = false,
+		                  Local_addr local_addr = (void *)0,
 		                  bool executable = false)
 		{
 			return _local()->attach(ds, size, offset, use_local_addr,
diff --git a/base-nova/include/rm_session/client.h b/base-nova/include/rm_session/client.h
index 10d58a464..c33d39da0 100644
--- a/base-nova/include/rm_session/client.h
+++ b/base-nova/include/rm_session/client.h
@@ -27,8 +27,9 @@ namespace Genode {
 		explicit Rm_session_client(Rm_session_capability session)
 		: Rpc_client<Rm_session>(session) { }
 
-		Local_addr attach(Dataspace_capability ds, size_t size, off_t offset,
-		                  bool use_local_addr, Local_addr local_addr,
+		Local_addr attach(Dataspace_capability ds, size_t size = 0,
+		                  off_t offset = 0, bool use_local_addr = false,
+		                  Local_addr local_addr = (void *)0,
 		                  bool executable = false)
 		{
 			return call<Rpc_attach>(ds, size, offset,
diff --git a/base/include/rm_session/client.h b/base/include/rm_session/client.h
index 4a8962618..26f9a30ca 100644
--- a/base/include/rm_session/client.h
+++ b/base/include/rm_session/client.h
@@ -26,7 +26,7 @@ namespace Genode {
 
 		Local_addr attach(Dataspace_capability ds, size_t size = 0,
 		                  off_t offset = 0, bool use_local_addr = false,
-		                  Local_addr local_addr = 0,
+		                  Local_addr local_addr = (void *)0,
 		                  bool executable = false)
 		{
 			return call<Rpc_attach>(ds, size, offset,