diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt
index 87bcadbd482..5619b1d58b8 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt
@@ -393,9 +393,10 @@ class Kotlin2JsGradlePluginIT : BaseGradleIT() {
             assertFileExists("build/test_node_modules/kotlin-js-plugin_test.js")
             assertFileExists("build/test_node_modules/kotlin-js-plugin_test.js.map")
 
+            val slash = File.separator
             assertFileContains(
                 "build/test_node_modules/kotlin-js-plugin_test.js.map",
-                "\"sources\":[\"../../src/test/kotlin/MainTest.kt\"]"
+                "\"sources\":[\"..$slash..${slash}src${slash}test${slash}kotlin${slash}MainTest.kt\"]"
             )
 
             assertTestResults("testProject/kotlin-js-plugin-project/tests.xml", "test")