diff --git a/idea/tests/org/jetbrains/kotlin/idea/run/runConfigurationTestUtil.kt b/idea/tests/org/jetbrains/kotlin/idea/run/runConfigurationTestUtil.kt
index 41a01d14f2f..fef7b30258c 100644
--- a/idea/tests/org/jetbrains/kotlin/idea/run/runConfigurationTestUtil.kt
+++ b/idea/tests/org/jetbrains/kotlin/idea/run/runConfigurationTestUtil.kt
@@ -65,7 +65,7 @@ fun createLibraryWithLongPaths(project: Project): Library {
             for (i in 0..maxCommandlineLengthWindows / maxFilenameLengthWindows) {
                 val tmpFile = VirtualFileManager.constructUrl(
                     LocalFileSystem.getInstance().protocol,
-                    FileUtil.createTempFile("file$i", "a".repeat(maxFilenameLengthWindows)).path
+                    FileUtil.createTempDirectory("file$i", "a".repeat(maxFilenameLengthWindows)).path
                 )
                 addRoot(tmpFile, OrderRootType.CLASSES)
             }