diff --git a/dokka-runners/dokka-gradle-plugin/src/main/kotlin/engine/parameters/builders/DokkaSourceSetBuilder.kt b/dokka-runners/dokka-gradle-plugin/src/main/kotlin/engine/parameters/builders/DokkaSourceSetBuilder.kt
index 4b397d1038..adb3e1615f 100644
--- a/dokka-runners/dokka-gradle-plugin/src/main/kotlin/engine/parameters/builders/DokkaSourceSetBuilder.kt
+++ b/dokka-runners/dokka-gradle-plugin/src/main/kotlin/engine/parameters/builders/DokkaSourceSetBuilder.kt
@@ -73,11 +73,11 @@ internal object DokkaSourceSetBuilder {
             sourceSetID = build(spec.sourceSetId.get()),
 
             // files
-            classpath = spec.classpath.files.toList(),
-            includes = spec.includes.files,
-            samples = spec.samples.files,
-            sourceRoots = spec.sourceRoots.files,
-            suppressedFiles = spec.suppressedFiles.files,
+            classpath = spec.classpath.asFileTree.files.toList(),
+            includes = spec.includes.asFileTree.files,
+            samples = spec.samples.asFileTree.files,
+            sourceRoots = spec.sourceRoots.asFileTree.files,
+            suppressedFiles = spec.suppressedFiles.asFileTree.files,
         )
     }