diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
index 0dca1acab7b..80ca7ceefe6 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
@@ -418,7 +418,7 @@ class KotlinKarma(override val compilation: KotlinJsCompilation) : KotlinJsTestF
 
         val args = nodeJsArgs +
                 nodeModules.map { npmProject.require(it) } +
-                listOf("start", karmaConfJs.absolutePath, "--debug")
+                listOf("start", karmaConfJs.absolutePath)
 
         return object : JSServiceMessagesTestExecutionSpec(
             forkOptions,