diff --git a/os/include/loader_session/client.h b/os/include/loader_session/client.h
index fcd12e929..131321680 100644
--- a/os/include/loader_session/client.h
+++ b/os/include/loader_session/client.h
@@ -26,13 +26,13 @@ namespace Loader {
 		explicit Session_client(Loader::Session_capability session)
 		: Rpc_client<Session>(session) { }
 
-		Dataspace_capability alloc_rom_module(Name const &name, Genode::size_t size) {
+		Dataspace_capability alloc_rom_module(Name const &name, size_t size) {
 			return call<Rpc_alloc_rom_module>(name, size); }
 
 		void commit_rom_module(Name const &name) {
 			call<Rpc_commit_rom_module>(name); }
 
-		void ram_quota(Genode::size_t quantum) {
+		void ram_quota(size_t quantum) {
 			call<Rpc_ram_quota>(quantum); }
 
 		void constrain_geometry(int width, int height) {
diff --git a/os/include/loader_session/connection.h b/os/include/loader_session/connection.h
index 2af34ce6c..1f3522a48 100644
--- a/os/include/loader_session/connection.h
+++ b/os/include/loader_session/connection.h
@@ -22,7 +22,7 @@ namespace Loader {
 
 	struct Connection : Genode::Connection<Session>, Session_client
 	{
-		Connection(Genode::size_t ram_quota)
+		Connection(size_t ram_quota)
 		:
 			Genode::Connection<Session>(session("ram_quota=%zd", ram_quota)),
 			Session_client(cap())
diff --git a/os/include/loader_session/loader_session.h b/os/include/loader_session/loader_session.h
index fe6f41359..5f4c37153 100644
--- a/os/include/loader_session/loader_session.h
+++ b/os/include/loader_session/loader_session.h
@@ -28,6 +28,12 @@ namespace Loader {
 
 	struct Session : Genode::Session
 	{
+		/*
+		 * Resolve ambiguity of 'size_t' type when using 'loader_session.h'
+		 * together with libc headers.
+		 */
+		typedef Genode::size_t size_t;
+
 		/*
 		 * Exception types
 		 */
@@ -69,8 +75,7 @@ namespace Loader {
 		 * becomes visible. The server frees intermediate dataspaces that are
 		 * no longer used.
 		 */
-		virtual Dataspace_capability alloc_rom_module(Name const    &name,
-		                                              Genode::size_t size) = 0;
+		virtual Dataspace_capability alloc_rom_module(Name const &name, size_t size) = 0;
 
 		/**
 		 * Expose ROM module to loaded subsystem
@@ -92,7 +97,7 @@ namespace Loader {
 		 * If 'ram_quota' is not called prior calling 'start', all available
 		 * session resources will be assigned to the subsystem.
 		 */
-		virtual void ram_quota(Genode::size_t quantum) = 0;
+		virtual void ram_quota(size_t quantum) = 0;
 
 		/**
 		 * Constrain size of the nitpicker buffer used by the subsystem
@@ -135,11 +140,11 @@ namespace Loader {
 		 *******************/
 
 		GENODE_RPC(Rpc_alloc_rom_module, Dataspace_capability, alloc_rom_module,
-		                                 Name const &, Genode::size_t);
+		                                 Name const &, size_t);
 		GENODE_RPC_THROW(Rpc_commit_rom_module, void, commit_rom_module,
 		                 GENODE_TYPE_LIST(Rom_module_does_not_exist),
 		                 Name const &);
-		GENODE_RPC(Rpc_ram_quota, void, ram_quota, Genode::size_t);
+		GENODE_RPC(Rpc_ram_quota, void, ram_quota, size_t);
 		GENODE_RPC(Rpc_constrain_geometry, void, constrain_geometry, int, int);
 		GENODE_RPC(Rpc_view_ready_sigh, void, view_ready_sigh, Signal_context_capability);
 		GENODE_RPC_THROW(Rpc_start, void, start,