diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/BasicBoxTest.kt b/js/js.tests/test/org/jetbrains/kotlin/js/test/BasicBoxTest.kt
index e8056f281f5..cddd23be00b 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/BasicBoxTest.kt
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/BasicBoxTest.kt
@@ -30,7 +30,10 @@ import org.jetbrains.kotlin.cli.common.messages.PrintingMessageCollector
 import org.jetbrains.kotlin.cli.common.output.outputUtils.writeAllTo
 import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
-import org.jetbrains.kotlin.config.*
+import org.jetbrains.kotlin.config.CommonConfigurationKeys
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.config.LanguageVersionSettings
+import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.incremental.js.IncrementalDataProviderImpl
 import org.jetbrains.kotlin.incremental.js.IncrementalResultsConsumerImpl
@@ -118,7 +121,6 @@ abstract class BasicBoxTest(
 
                 val outputFileName = module.outputFileName(outputDir) + ".js"
                 generateJavaScriptFile(file.parent, module, outputFileName, dependencies, friends, modules.size > 1,
-                                       ENABLE_MULTIPLATFORM.matcher(fileContent).find(),
                                        !SKIP_SOURCEMAP_REMAPPING.matcher(fileContent).find(),
                                        outputPrefixFile, outputPostfixFile, mainCallParameters)
 
@@ -286,7 +288,6 @@ abstract class BasicBoxTest(
             dependencies: List<String>,
             friends: List<String>,
             multiModule: Boolean,
-            multiplatform: Boolean,
             remap: Boolean,
             outputPrefixFile: File?,
             outputPostfixFile: File?,
@@ -306,7 +307,7 @@ abstract class BasicBoxTest(
         val psiFiles = createPsiFiles(allSourceFiles.sortedBy { it.canonicalPath }.map { it.canonicalPath })
 
         val sourceDirs = (testFiles + additionalFiles).map { File(it).parent }.distinct()
-        val config = createConfig(sourceDirs, module, dependencies, friends, multiModule, multiplatform, incrementalData = null)
+        val config = createConfig(sourceDirs, module, dependencies, friends, multiModule, incrementalData = null)
         val outputFile = File(outputFileName)
 
         val incrementalData = IncrementalData()
@@ -314,7 +315,7 @@ abstract class BasicBoxTest(
                        mainCallParameters, incrementalData, remap)
 
         if (module.hasFilesToRecompile) {
-            checkIncrementalCompilation(sourceDirs, module, kotlinFiles, dependencies, friends, multiModule, multiplatform, remap,
+            checkIncrementalCompilation(sourceDirs, module, kotlinFiles, dependencies, friends, multiModule, remap,
                                         outputFile, outputPrefixFile, outputPostfixFile, mainCallParameters, incrementalData)
         }
     }
@@ -326,7 +327,6 @@ abstract class BasicBoxTest(
             dependencies: List<String>,
             friends: List<String>,
             multiModule: Boolean,
-            multiplatform: Boolean,
             remap: Boolean,
             outputFile: File,
             outputPrefixFile: File?,
@@ -349,7 +349,7 @@ abstract class BasicBoxTest(
                 .sortedBy { it.canonicalPath }
                 .map { sourceToTranslationUnit[it]!! }
 
-        val recompiledConfig = createConfig(sourceDirs, module, dependencies, friends, multiModule, multiplatform, incrementalData)
+        val recompiledConfig = createConfig(sourceDirs, module, dependencies, friends, multiModule, incrementalData)
         val recompiledOutputFile = File(outputFile.parentFile, outputFile.nameWithoutExtension + "-recompiled.js")
 
         translateFiles(translationUnits, recompiledOutputFile, recompiledConfig, outputPrefixFile, outputPostfixFile,
@@ -528,8 +528,8 @@ abstract class BasicBoxTest(
     private fun createPsiFiles(fileNames: List<String>): List<KtFile> = fileNames.map(this::createPsiFile)
 
     private fun createConfig(
-            sourceDirs: List<String>,module: TestModule, dependencies: List<String>, friends: List<String>,
-            multiModule: Boolean, multiplatform: Boolean, incrementalData: IncrementalData?
+            sourceDirs: List<String>, module: TestModule, dependencies: List<String>, friends: List<String>,
+            multiModule: Boolean, incrementalData: IncrementalData?
     ): JsConfig {
         val configuration = environment.configuration.copy()
 
@@ -562,15 +562,6 @@ abstract class BasicBoxTest(
 
         configuration.put(JSConfigurationKeys.TYPED_ARRAYS_ENABLED, typedArraysEnabled)
 
-        if (multiplatform) {
-            val defaultLanguageVersionSettings = configuration.languageVersionSettings
-            configuration.languageVersionSettings = object : LanguageVersionSettings by defaultLanguageVersionSettings {
-                override fun getFeatureSupport(feature: LanguageFeature): LanguageFeature.State =
-                        if (feature == LanguageFeature.MultiPlatformProjects) LanguageFeature.State.ENABLED
-                        else defaultLanguageVersionSettings.getFeatureSupport(feature)
-            }
-        }
-
         return JsConfig(project, configuration, METADATA_CACHE, (JsConfig.JS_STDLIB + JsConfig.JS_KOTLIN_TEST).toSet())
     }
 
@@ -720,7 +711,6 @@ abstract class BasicBoxTest(
         private val EXPECTED_REACHABLE_NODES = Pattern.compile("^// *$EXPECTED_REACHABLE_NODES_DIRECTIVE: *([0-9]+) *$", Pattern.MULTILINE)
         private val RECOMPILE_PATTERN = Pattern.compile("^// *RECOMPILE *$", Pattern.MULTILINE)
         private val SOURCE_MAP_SOURCE_EMBEDDING = Regex("^// *SOURCE_MAP_EMBED_SOURCES: ([A-Z]+)*\$", RegexOption.MULTILINE)
-        private val ENABLE_MULTIPLATFORM = Pattern.compile("^// *MULTIPLATFORM *$", Pattern.MULTILINE)
 
         val TEST_MODULE = "JS_TESTS"
         private val DEFAULT_MODULE = "main"
diff --git a/js/js.translator/testData/box/kotlin.test/mpp.kt b/js/js.translator/testData/box/kotlin.test/mpp.kt
index 2e8082ec587..83c2773fafc 100644
--- a/js/js.translator/testData/box/kotlin.test/mpp.kt
+++ b/js/js.translator/testData/box/kotlin.test/mpp.kt
@@ -1,7 +1,6 @@
+// !LANGUAGE: +MultiPlatformProjects
 // EXPECTED_REACHABLE_NODES: 1173
-// MULTIPLATFORM
 
-// MODULE: lib
 // FILE: lib.kt
 import kotlin.test.Test
 
@@ -9,7 +8,6 @@ expect class PlatformTest {
     @Test fun platformTest()
 }
 
-// MODULE: main(lib)
 // FILE: main.kt
 import kotlin.test.Test
 
@@ -24,4 +22,4 @@ fun box() = checkLog {
         test("platformTest")
         test("someOtherTest")
     }
-}
\ No newline at end of file
+}