diff --git a/xml/dtd/pentestreport.xsd b/xml/dtd/pentestreport.xsd
index f6dce87..27314e9 100644
--- a/xml/dtd/pentestreport.xsd
+++ b/xml/dtd/pentestreport.xsd
@@ -190,7 +190,7 @@
       <xs:attribute ref="pieElem" use="required"/>
       <xs:attribute ref="pieHeight" use="required"/>
       <xs:attribute ref="status" use="optional"/>
-      <xs:attribute ref="threshold" use="required"/>
+      <xs:attribute ref="threshold" use="optional" default="1"/>
     </xs:complexType>
   </xs:element>
 
diff --git a/xml/xslt/piecharts.xslt b/xml/xslt/piecharts.xslt
index 69cf971..07229ee 100644
--- a/xml/xslt/piecharts.xslt
+++ b/xml/xslt/piecharts.xslt
@@ -12,7 +12,12 @@
                     <xsl:with-param name="pieElem" select="@pieElem"/>
                     <xsl:with-param name="pieHeight" select="@pieHeight"/>
                     <xsl:with-param name="status" select="@status"/>
-                    <xsl:with-param name="threshold" select="@threshold"/>
+                    <xsl:with-param name="threshold">
+                        <xsl:choose>
+                            <xsl:when test="@threshold"><xsl:value-of select="@threshold"/></xsl:when>
+                            <xsl:otherwise>1</xsl:otherwise>
+                        </xsl:choose>
+                    </xsl:with-param>
                 </xsl:call-template>
             </xsl:when>
             <xsl:otherwise>