diff --git a/xslt/manualcsv2xml.xslt b/xslt/manualcsv2xml.xslt
index 50fc241e8..e7f295566 100644
--- a/xslt/manualcsv2xml.xslt
+++ b/xslt/manualcsv2xml.xslt
@@ -85,7 +85,7 @@
       </xsl:choose>
     </xsl:variable>
 
-    <xsl:if test="$number >= 0">
+    <xsl:if test="number($number) = $number">
     <dive>
       <xsl:attribute name="date">
         <xsl:choose>