diff --git a/util/mario/frontend.py b/util/mario/frontend.py
index 3855c2d..a252f88 100644
--- a/util/mario/frontend.py
+++ b/util/mario/frontend.py
@@ -11,7 +11,7 @@
 import math
 from mako.template import Template
 
-NUM_PROT_BITS = 3 - 1
+NUM_PROT_BITS = 3
 
 
 def render_register(content: dict):
@@ -132,8 +132,8 @@ def render_reg_hjson(fe_ids: dict, tpl_file: str) -> str:
             'params': params,
             'registers': regs,
             'dim_range': f'{10+num_dim_bits}:10',
-            'src_prot_range': f'{10+num_dim_bits+NUM_PROT_BITS}:{10+num_dim_bits}',
-            'dst_prot_range': f'{10+num_dim_bits+2*NUM_PROT_BITS}:{10+num_dim_bits+NUM_PROT_BITS}'
+            'src_prot_range': f'{10+num_dim_bits+NUM_PROT_BITS}:{10+num_dim_bits+1}',
+            'dst_prot_range': f'{10+num_dim_bits+2*NUM_PROT_BITS}:{10+num_dim_bits+NUM_PROT_BITS+1}'
         }
 
         # render