diff --git a/configure.php b/configure.php
index 1a07591639..1f52de3608 100755
--- a/configure.php
+++ b/configure.php
@@ -839,6 +839,9 @@ function xinclude_residual_fixup( DOMDocument $dom )
             case "variablelist":
                 $fixup = "<varlistentry><term></term><listitem><simpara>$alert</simpara></listitem></varlistentry>";
                 break;
+            case "classsynopsis":
+                $fixup = "<classsynopsisinfo role='comment'>$alert</classsynopsisinfo>";
+                break;
             default:
                 echo "  (Unknown parent of failed XInclude: $parent)\n";
                 $hardfail = true;