diff --git a/usas-annotation/insert-usas-annotations.xsl b/usas-annotation/insert-usas-annotations.xsl
index 17a699d88bea629e5bfa05f681291298625debc0..87eba525ef9317bfba30eaab86709960cee77425 100644
--- a/usas-annotation/insert-usas-annotations.xsl
+++ b/usas-annotation/insert-usas-annotations.xsl
@@ -48,7 +48,7 @@
             <xsl:variable name="doc" select="document($file-ref)"/>
             <!-- overwrite the document -->
             <xsl:for-each select="$doc">
-               <xsl:result-document href="{$file-ref}">
+               <xsl:result-document href="{$file-ref}.usas">
                       <xsl:apply-templates/>
                </xsl:result-document>     
             </xsl:for-each>