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 86a54323a20..b43c5c1b1e5 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
@@ -90,7 +90,11 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) :
             add(adapter.canonicalPath)
             addAll(cliArgs.toList())
             addAll(cliArg("--reporter", "kotlin-test-js-runner/mocha-kotlin-reporter.js"))
-            addAll(cliArg("--timeout", timeout))
+            if (debug) {
+                add(NO_TIMEOUT_ARG)
+            } else {
+                addAll(cliArg(TIMEOUT_ARG, timeout))
+            }
         }
 
         return TCServiceMessagesTestExecutionSpec(
@@ -135,4 +139,7 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) :
 
         private const val DEFAULT_TIMEOUT = "2s"
     }
-}
\ No newline at end of file
+}
+
+private const val TIMEOUT_ARG = "--timeout"
+private const val NO_TIMEOUT_ARG = "--no-timeout"
\ No newline at end of file