diff --git a/compiler/fir/tree/build.gradle.kts b/compiler/fir/tree/build.gradle.kts
index e113aff2879..43aa2ee46dc 100644
--- a/compiler/fir/tree/build.gradle.kts
+++ b/compiler/fir/tree/build.gradle.kts
@@ -28,7 +28,7 @@ dependencies {
     generatorClasspath(project("tree-generator"))
 }
 
-val generationRoot = File(projectDir.resolve("gen"))
+val generationRoot = projectDir.resolve("gen")
 
 val generateTree by tasks.registering(NoDebugJavaExec::class) {