diff --git a/src/axi_pkg.sv b/src/axi_pkg.sv
index 583846491..3f723e262 100644
--- a/src/axi_pkg.sv
+++ b/src/axi_pkg.sv
@@ -198,7 +198,7 @@ package axi_pkg;
   beat_lower_byte(largest_addr_t addr, size_t size, len_t len, burst_t burst,
       shortint unsigned strobe_width, shortint unsigned i_beat);
     largest_addr_t _addr = beat_addr(addr, size, len, burst, i_beat);
-    return _addr - (_addr / strobe_width) * strobe_width;
+    return shortint'(_addr - (_addr / strobe_width) * strobe_width);
   endfunction
 
   /// Index of highest byte in beat (see A3-51).