diff --git a/litex/soc/cores/cpu/naxriscv/core.py b/litex/soc/cores/cpu/naxriscv/core.py
index 211e54fb4..ff898c608 100644
--- a/litex/soc/cores/cpu/naxriscv/core.py
+++ b/litex/soc/cores/cpu/naxriscv/core.py
@@ -92,8 +92,8 @@ class NaxRiscv(CPU):
     @staticmethod
     def args_fill(parser):
         cpu_group = parser.add_argument_group("cpu")
-        cpu_group.add_argument("--scala-file", action='append', help="Specify the scala files used to configure NaxRiscv")
-        cpu_group.add_argument("--xlen", help="Specify the RISC-V data width")
+        cpu_group.add_argument("--scala-file", action="append", help="Specify the scala files used to configure NaxRiscv.")
+        cpu_group.add_argument("--xlen",       default=32,      help="Specify the RISC-V data width.")
 
     @staticmethod
     def args_read(args):