diff --git a/transform_kml_tariff_zone/transformation.xsl b/transform_kml_tariff_zone/transformation.xsl
index 69f1b0c..c695d42 100644
--- a/transform_kml_tariff_zone/transformation.xsl
+++ b/transform_kml_tariff_zone/transformation.xsl
@@ -52,7 +52,7 @@
 
   <xsl:template match="/kml:MultiGeometry/kml:Polygon/kml:outerBoundaryIs/kml:LinearRing/kml:coordinates" name="polygon">
     <xsl:for-each select="kml:MultiGeometry/kml:Polygon/kml:outerBoundaryIs/kml:LinearRing/kml:coordinates">
-      <xsl:value-of disable-output-escaping="yes" select="fn:replace(., '(\d+\.\d+),(\d+\.\d+),0\s?', '$2 $1 ')"/>
+      <xsl:value-of disable-output-escaping="yes" select="fn:replace(., '(-?\d+\.\d+),(-?\d+\.\d+),0\s?', '$2 $1 ')"/>
     </xsl:for-each>
   </xsl:template>
 </xsl:transform>