diff --git a/core/include/ariane_pkg.sv b/core/include/ariane_pkg.sv
index 1bfc7a999..9c0e2b2dc 100644
--- a/core/include/ariane_pkg.sv
+++ b/core/include/ariane_pkg.sv
@@ -96,7 +96,7 @@ package ariane_pkg;
 
     function automatic logic range_check(logic[63:0] base, logic[63:0] len, logic[63:0] address);
       // if len is a power of two, and base is properly aligned, this check could be simplified
-      return (address >= base) && (address < (base+len));
+      return (address >= base) && (address < (65'(base)+len));
     endfunction : range_check
 
     function automatic logic is_inside_nonidempotent_regions (ariane_cfg_t Cfg, logic[63:0] address);