diff --git a/repos/ports/include/noux_session/sysio.h b/repos/ports/include/noux_session/sysio.h
index 82b96bf6af..a8bd724e06 100644
--- a/repos/ports/include/noux_session/sysio.h
+++ b/repos/ports/include/noux_session/sysio.h
@@ -54,7 +54,7 @@ struct Noux::Sysio
 	enum { CHUNK_SIZE = 64*1024 };
 	typedef char Chunk[CHUNK_SIZE];
 
-	enum { ARGS_MAX_LEN = 5*1024 };
+	enum { ARGS_MAX_LEN = 16*1024 };
 	typedef char Args[ARGS_MAX_LEN];
 
 	enum { ENV_MAX_LEN  = 6*1024 };
diff --git a/repos/ports/src/lib/libc_noux/plugin.cc b/repos/ports/src/lib/libc_noux/plugin.cc
index 55b220f467..a1385f143d 100644
--- a/repos/ports/src/lib/libc_noux/plugin.cc
+++ b/repos/ports/src/lib/libc_noux/plugin.cc
@@ -2278,7 +2278,7 @@ void Plugin::init(Genode::Env &env)
 	sigemptyset(&signal_mask);
 
 	/* copy command-line arguments from 'args' ROM dataspace */
-	enum { MAX_ARGS = 256, ARG_BUF_SIZE = 4096UL };
+	enum { MAX_ARGS = 256, ARG_BUF_SIZE = sizeof(Noux::Sysio::Args) };
 	static char *argv[MAX_ARGS];
 	static char  arg_buf[ARG_BUF_SIZE];
 	{
diff --git a/repos/ports/src/noux/child.h b/repos/ports/src/noux/child.h
index f24db9d67e..732f3b6b28 100644
--- a/repos/ports/src/noux/child.h
+++ b/repos/ports/src/noux/child.h
@@ -146,7 +146,7 @@ class Noux::Child : public Rpc_object<Session>,
 		 * Entrypoint used to serve the RPC interfaces of the
 		 * locally-provided services
 		 */
-		enum { STACK_SIZE = 8*1024*sizeof(long) };
+		enum { STACK_SIZE = 64*1024 };
 		Rpc_entrypoint _ep { &_env.pd(), STACK_SIZE, "noux_process", false };
 
 		Pd_session                  &_ref_pd;
@@ -194,6 +194,8 @@ class Noux::Child : public Rpc_object<Session>,
 		/**
 		 * Command line arguments
 		 */
+		enum { ARGS_DS_SIZE = sizeof(Sysio::Args) };
+
 		Args_dataspace _args;
 
 		/**
@@ -242,8 +244,6 @@ class Noux::Child : public Rpc_object<Session>,
 			throw Invalid_fd();
 		}
 
-		enum { ARGS_DS_SIZE = 4096 };
-
 		/**
 		 * Let specified child inherit our file descriptors
 		 */