diff --git a/spectool/schema_2_kaxsemantic_cpp.xsl b/spectool/schema_2_kaxsemantic_cpp.xsl
index ad33c911..756f1822 100644
--- a/spectool/schema_2_kaxsemantic_cpp.xsl
+++ b/spectool/schema_2_kaxsemantic_cpp.xsl
@@ -410,7 +410,7 @@ static constexpr const MatroskaProfile VERSION_DIVX_ONLY    = {false, true, Matr
         <xsl:call-template name="get-class-name">
             <xsl:with-param name="node" select="."/>
         </xsl:call-template>
-        <xsl:text>::RenderData(libebml::IOCallback &amp; /* output */, bool /* bForceRender */, ShouldWrite /* writeFilter */) {&#10;</xsl:text>
+        <xsl:text>::RenderData(libebml::IOCallback &amp; /* output */, bool /* bForceRender */, const ShouldWrite &amp; /* writeFilter */) {&#10;</xsl:text>
         <xsl:text>  assert(false); // no you are not allowed to use this element !&#10;</xsl:text>
         <xsl:text>  return 0;&#10;</xsl:text>
         <xsl:text>}&#10;</xsl:text>
diff --git a/spectool/schema_2_kaxsemantic_h.xsl b/spectool/schema_2_kaxsemantic_h.xsl
index eeac1086..06dc3024 100644
--- a/spectool/schema_2_kaxsemantic_h.xsl
+++ b/spectool/schema_2_kaxsemantic_h.xsl
@@ -106,7 +106,7 @@ namespace libmatroska {
             <xsl:text>public:&#10;</xsl:text>
         </xsl:if>
         <xsl:if test="@maxver='0' or @maxver='1' or @maxver='2' or @maxver='3'">
-            <xsl:text>  libebml::filepos_t RenderData(libebml::IOCallback &amp; output, bool bForceRender, ShouldWrite writeFilter) override;&#10;</xsl:text>
+            <xsl:text>  libebml::filepos_t RenderData(libebml::IOCallback &amp; output, bool bForceRender, const ShouldWrite &amp; writeFilter) override;&#10;</xsl:text>
         </xsl:if>
         <xsl:text>};&#10;</xsl:text>
         <!-- <xsl:if test="$minVer &gt; 1 or ebml:extension[@divx='1']">#endif&#10;</xsl:if> -->