diff --git a/tests/simple.yml b/tests/simple.yml
index 3722acc..024d35b 100644
--- a/tests/simple.yml
+++ b/tests/simple.yml
@@ -143,6 +143,12 @@
   total_forks: 20
 -
   _id: 15
+  when: 2024-06-23T22:23:22.8492Z
+  what: dimensions-of-terrain
+  total_repositories: 4
+  total_forks: 21
+-
+  _id: 16
   what: reconciliation
   when: 2024-07-01T22:22:22.8492Z
   who: 6305016
diff --git a/xsl/dot.xsl b/xsl/dot.xsl
index 7f4da15..c963915 100644
--- a/xsl/dot.xsl
+++ b/xsl/dot.xsl
@@ -88,7 +88,7 @@ SOFTWARE.
             </td>
             <xsl:for-each select="1 to $weeks">
               <xsl:variable name="week" select="xs:integer(.)"/>
-              <xsl:variable name="f" select="$dot_facts[z:in-week(when, $week) and last()]"/>
+              <xsl:variable name="f" select="$dot_facts[z:in-week(when, $week)][last()]"/>
               <td class="ff right">
                 <xsl:choose>
                   <xsl:when test="$f">