diff --git a/src/main/java/org/eolang/jeo/representation/CanonicalXmir.java b/src/main/java/org/eolang/jeo/representation/CanonicalXmir.java
index 9991b2a78..5eadd2dd9 100644
--- a/src/main/java/org/eolang/jeo/representation/CanonicalXmir.java
+++ b/src/main/java/org/eolang/jeo/representation/CanonicalXmir.java
@@ -147,6 +147,7 @@ private XML parse(final String eoprog) throws IOException {
      * @return Unrolled XMIR.
      */
     private static XML unroll(final XML parsed) {
+//        TODO: We can remove roll-data!
         return new Xsline(
             new TrFast(
                 new TrJoined<Shift>(
diff --git a/src/main/resources/org/eolang/parser/roll-data.xsl b/src/main/resources/org/eolang/parser/roll-data.xsl
index 66cd6b6f6..f2497d5f3 100644
--- a/src/main/resources/org/eolang/parser/roll-data.xsl
+++ b/src/main/resources/org/eolang/parser/roll-data.xsl
@@ -33,7 +33,7 @@ SOFTWARE.
   </o>
   -->
   <xsl:output encoding="UTF-8" method="xml"/>
-  <xsl:template match="o[count(o)=1 and o[count(o)=1 and o[@data='bytes']]]">
+  <xsl:template match="o[count(o)=1 and o[count(o)=1 and o[@base='bytes']]]">
     <xsl:element name="o">
       <xsl:for-each select="@*">
         <xsl:attribute name="{name()}">
@@ -42,7 +42,6 @@ SOFTWARE.
       </xsl:for-each>
       <xsl:element name="o">
         <xsl:attribute name="base" select="'bytes'"/>
-        <xsl:attribute name="data" select="'bytes'"/>
         <xsl:value-of select="o[1]/o[1]/text()"/>
       </xsl:element>
     </xsl:element>