diff --git a/repos/base-nova/src/core/include/rpc_cap_factory.h b/repos/base-nova/src/core/include/rpc_cap_factory.h
index 4a8b56f76..fc906c893 100644
--- a/repos/base-nova/src/core/include/rpc_cap_factory.h
+++ b/repos/base-nova/src/core/include/rpc_cap_factory.h
@@ -35,7 +35,10 @@ class Genode::Rpc_cap_factory
 			Cap_object(addr_t cap_sel) : _cap_sel(cap_sel) {}
 		};
 
-		Tslab<Cap_object, 128> _slab;
+		enum { SBS = 960*sizeof(long) };
+		uint8_t _initial_sb[SBS];
+
+		Tslab<Cap_object, SBS> _slab;
 		List<Cap_object>       _list;
 		Lock                   _lock;
 
diff --git a/repos/base-nova/src/core/rpc_cap_factory.cc b/repos/base-nova/src/core/rpc_cap_factory.cc
index 695d6f1fb..04574a46a 100644
--- a/repos/base-nova/src/core/rpc_cap_factory.cc
+++ b/repos/base-nova/src/core/rpc_cap_factory.cc
@@ -80,7 +80,8 @@ void Rpc_cap_factory::free(Native_capability cap)
 }
 
 
-Rpc_cap_factory::Rpc_cap_factory(Allocator &md_alloc) : _slab(&md_alloc) { }
+Rpc_cap_factory::Rpc_cap_factory(Allocator &md_alloc)
+: _slab(md_alloc, _initial_sb) { }
 
 
 Rpc_cap_factory::~Rpc_cap_factory()