diff --git a/contrib/checkstyle/src/mill/contrib/checkstyle/CheckstyleXsltModule.scala b/contrib/checkstyle/src/mill/contrib/checkstyle/CheckstyleXsltModule.scala
index 0fbc073644a..8a0b7021d2f 100644
--- a/contrib/checkstyle/src/mill/contrib/checkstyle/CheckstyleXsltModule.scala
+++ b/contrib/checkstyle/src/mill/contrib/checkstyle/CheckstyleXsltModule.scala
@@ -47,6 +47,12 @@ trait CheckstyleXsltModule extends CheckstyleModule {
    */
   final override def checkstyleFormat: T[String] = "xml"
 
+  /**
+   * Folder containing the XSLT transformations. Defaults to `checkstyle-xslt`
+   * in  the workspace root, but can be overriden on a per-module basis
+   */
+  def checkstyleXsltfFolder = T.source(T.workspace / "checkstyle-xslt")
+
   /**
    * Set of [[CheckstyleXsltReport]]s.
    *
@@ -69,7 +75,7 @@ trait CheckstyleXsltModule extends CheckstyleModule {
    * }}}
    */
   def checkstyleXsltReports: T[Set[CheckstyleXsltReport]] = T {
-    val dir = millSourcePath / "checkstyle-xslt"
+    val dir = checkstyleXsltfFolder().path
 
     if (os.exists(dir)) {
       val dest = T.dest