diff --git a/native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/AbstractNativeCodegenBoxTest.kt b/native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/AbstractNativeCodegenBoxTest.kt
index c7dd39ccbe5..7f3e0f0c651 100644
--- a/native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/AbstractNativeCodegenBoxTest.kt
+++ b/native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/AbstractNativeCodegenBoxTest.kt
@@ -6,6 +6,8 @@
 package org.jetbrains.kotlin.konan.blackboxtest
 
 import com.intellij.testFramework.TestDataFile
+import org.jetbrains.kotlin.konan.blackboxtest.support.ClassLevelProperty
+import org.jetbrains.kotlin.konan.blackboxtest.support.group.DisabledTestsIfProperty
 import org.jetbrains.kotlin.konan.blackboxtest.support.settings.ExternalSourceTransformersProvider
 import org.jetbrains.kotlin.konan.blackboxtest.support.util.ExternalSourceTransformer
 import org.jetbrains.kotlin.konan.blackboxtest.support.util.ExternalSourceTransformers
@@ -13,6 +15,11 @@ import org.jetbrains.kotlin.konan.blackboxtest.support.util.ThreadSafeCache
 import org.jetbrains.kotlin.konan.blackboxtest.support.util.getAbsoluteFile
 import java.io.File
 
+@DisabledTestsIfProperty( // Temporarily disable String codegen/box tests with "-opt"
+    sourceLocations = ["compiler/testData/codegen/box/strings/*.kt"],
+    property = ClassLevelProperty.OPTIMIZATION_MODE,
+    propertyValue = "OPT"
+)
 abstract class AbstractNativeCodegenBoxTest : ExternalSourceTransformersProvider, AbstractNativeBlackBoxTest() {
     private val registeredSourceTransformers: ThreadSafeCache<File, MutableList<ExternalSourceTransformer>> = ThreadSafeCache()