diff --git a/libraries/stdlib/js-ir/build.gradle.kts b/libraries/stdlib/js-ir/build.gradle.kts
index 2e9046e3500..ec554930a7a 100644
--- a/libraries/stdlib/js-ir/build.gradle.kts
+++ b/libraries/stdlib/js-ir/build.gradle.kts
@@ -150,8 +150,11 @@ tasks.withType<KotlinCompile<*>>().configureEach {
 
 val compileKotlinJs by tasks.existing(KotlinCompile::class) {
     kotlinOptions.freeCompilerArgs += "-Xir-module-name=kotlin"
-}
 
+    if (!kotlinBuildProperties.disableWerror) {
+        kotlinOptions.allWarningsAsErrors = true
+    }
+}
 
 val compileTestKotlinJs by tasks.existing(KotlinCompile::class) {
     val sources: FileCollection = kotlin.sourceSets["commonTest"].kotlin
diff --git a/libraries/stdlib/js-ir/runtime/jsIntrinsics.kt b/libraries/stdlib/js-ir/runtime/jsIntrinsics.kt
index f9cd6eee603..62937340ad5 100644
--- a/libraries/stdlib/js-ir/runtime/jsIntrinsics.kt
+++ b/libraries/stdlib/js-ir/runtime/jsIntrinsics.kt
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:Suppress("NON_MEMBER_FUNCTION_NO_BODY")
+@file:Suppress("NON_MEMBER_FUNCTION_NO_BODY", "UNUSED_PARAMETER", "unused")
 
 package kotlin.js