diff --git a/kotlin-native/build-tools/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy b/kotlin-native/build-tools/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy
index 7a178640543..e59846e54c5 100644
--- a/kotlin-native/build-tools/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy
+++ b/kotlin-native/build-tools/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy
@@ -228,7 +228,7 @@ class RunExternalTestGroup extends JavaExec implements CompilerRunner {
             }
         }
 
-        def experimentalSettings = findLinesWithPrefixesRemoved(text, "// !USE_EXPERIMENTAL: ")
+        def experimentalSettings = findLinesWithPrefixesRemoved(text, "// !OPT_IN: ")
         if (experimentalSettings.size() != 0) {
             experimentalSettings.forEach { line ->
                 line.split(" ").toList().forEach { flags.add("-opt-in=$it") }