diff --git a/parser/jaz.jison b/parser/jaz.jison
index 7fd7089..52bd166 100644
--- a/parser/jaz.jison
+++ b/parser/jaz.jison
@@ -514,7 +514,7 @@ e12
     : e12 '^' e11
         {
             if (($1.type == "NUMBER") && ($3.type == "NUMBER")) {
-                $$ = { type: "NUMBER", value: $1.value.or($3.value).and(__MASK__) };
+                $$ = { type: "NUMBER", value: $1.value.xor($3.value).and(__MASK__) };
             } else {
                 $$ = { type: "OP", op: "^", values: [$1, $3] };
             }
diff --git a/parser/jaz.js b/parser/jaz.js
index 60c32fa..1d202be 100644
--- a/parser/jaz.js
+++ b/parser/jaz.js
@@ -361,7 +361,7 @@ break;
 case 59:
 
             if (($$[$0-2].type == "NUMBER") && ($$[$0].type == "NUMBER")) {
-                this.$ = { type: "NUMBER", value: $$[$0-2].value.or($$[$0].value).and(__MASK__) };
+                this.$ = { type: "NUMBER", value: $$[$0-2].value.xor($$[$0].value).and(__MASK__) };
             } else {
                 this.$ = { type: "OP", op: "^", values: [$$[$0-2], $$[$0]] };
             }