diff --git a/gcc/rv2fox b/gcc/rv2fox
index 552ecd0..9d3b5fe 100755
--- a/gcc/rv2fox
+++ b/gcc/rv2fox
@@ -208,6 +208,8 @@ class Converter:
         """
         if reg == 'sp':
             return 'rsp'
+        elif reg == 'zero':
+            return f'0';
         elif reg in self.regidx:
             return f'r{self.regidx[reg]}'
         elif reg in self.xregidx: