diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt
index 03d63b702d1..286c3a14a3e 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt
@@ -55,12 +55,10 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) : KotlinJsTestF
 
         val args = nodeJsArgs +
                 nodeModules.map {
-                    npmProject.nodeModulesDir.resolve(it).also { file ->
-                        check(file.isFile) { "Cannot find ${file.canonicalPath}" }
-                    }.canonicalPath
+                    npmProject.require(it)
                 } +
                 listOf(
-                    "-r", "kotlin-nodejs-source-map-support.js",
+                    "-r", "kotlin-test-nodejs-runner/kotlin-nodejs-source-map-support.js",
                     "--reporter", "mocha-teamcity-reporter"
                 )