diff --git a/plugins/imports-dumper/tests/org/jetbrains/kotlin/importsDumper/ImportsDumperTest.kt b/plugins/imports-dumper/tests/org/jetbrains/kotlin/importsDumper/ImportsDumperTest.kt
index 90695549ac2..1059a01acf6 100644
--- a/plugins/imports-dumper/tests/org/jetbrains/kotlin/importsDumper/ImportsDumperTest.kt
+++ b/plugins/imports-dumper/tests/org/jetbrains/kotlin/importsDumper/ImportsDumperTest.kt
@@ -70,6 +70,6 @@ class ImportsDumperTest : TestCaseWithTmpdir() {
 
 private fun String.relativizeAbsolutePaths(relativeTo: File): String {
     // JSON escapes slashes
-    val pattern = relativeTo.absoluteFile.toString().replace("/", "\\/")
+    val pattern = relativeTo.absoluteFile.toString().replace(File.separatorChar.toString(), "\\/")
     return this.replace(pattern, "\$TESTDATA_DIR$")
 }