diff --git a/xslt/uddf-export.xslt b/xslt/uddf-export.xslt
index 8a24f0ebe..9b33149d4 100644
--- a/xslt/uddf-export.xslt
+++ b/xslt/uddf-export.xslt
@@ -583,7 +583,9 @@
         </visibility>
         <equipmentused>
           <leadquantity>
-            <xsl:value-of select="sum(xt:node-set($trimmedweightlist))"/>
+            <xsl:if test="sum(xt:node-set($trimmedweightlist)) >= 0">
+              <xsl:value-of select="sum(xt:node-set($trimmedweightlist))"/>
+            </xsl:if>
           </leadquantity>
         </equipmentused>