diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt
index 73e12c5b8a5..0988f8c0b8d 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt
@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.idea.highlighter
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.VfsUtil
 import com.intellij.openapi.vfs.VirtualFile
-import java.io.File
+import java.nio.file.Paths
 
 object OutsidersPsiFileSupportUtils {
     fun getOutsiderFileOrigin(project: Project, virtualFile: VirtualFile): VirtualFile? {
@@ -16,9 +16,8 @@ object OutsidersPsiFileSupportUtils {
 
         val originalFilePath = OutsidersPsiFileSupportWrapper.getOriginalFilePath(virtualFile) ?: return null
 
-        return generateSequence(File(originalFilePath)) { if (it.canonicalPath == project.baseDir.canonicalPath) null else it.parentFile }
-            .filter { it.exists() }
-            .firstOrNull()
-            ?.let { VfsUtil.findFileByIoFile(it, false) }
+        return generateSequence(VfsUtil.findFile(Paths.get(originalFilePath), true)) {
+            if (it == project.baseDir) null else it.parent
+        }.filter { it.exists() }.firstOrNull()
     }
 }
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