diff --git a/compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/CompilerApiTest.kt b/compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/CompilerApiTest.kt
index d13453d44e2..a10cc97b3e0 100644
--- a/compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/CompilerApiTest.kt
+++ b/compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/CompilerApiTest.kt
@@ -152,8 +152,10 @@ class CompilerApiTest : KotlinIntegrationTestBase() {
 
     fun testSimpleScriptLocal() {
         val messageCollector = TestMessageCollector()
-        val (code, outputs) = compileLocally(messageCollector, File(getSimpleScriptBaseDir(), "script.kts").absolutePath,
-                                             "-d", tmpdir.absolutePath, "-Xreport-output-files", "-Xallow-any-scripts-in-source-roots")
+        val (code, outputs) = compileLocally(
+            messageCollector, File(getSimpleScriptBaseDir(), "script.kts").absolutePath,
+            "-d", tmpdir.absolutePath, "-Xreport-output-files", "-Xuse-fir-lt=false", "-Xallow-any-scripts-in-source-roots"
+        )
         Assert.assertEquals(0, code)
         Assert.assertTrue(outputs.isNotEmpty())
         Assert.assertEquals(File(tmpdir, "Script.class").absolutePath, outputs.first().outputFile?.absolutePath)
@@ -172,9 +174,9 @@ class CompilerApiTest : KotlinIntegrationTestBase() {
                                                              inheritMemoryLimits = false, inheritOtherJvmOptions = false, inheritAdditionalProperties = false)
             try {
                 val (code, outputs) = compileOnDaemon(
-                        flagFile, compilerId, daemonJVMOptions, daemonOptions, TestMessageCollector(),
-                        File(getSimpleScriptBaseDir(), "script.kts").absolutePath,
-                        "-Xreport-output-files", "-Xallow-any-scripts-in-source-roots", "-d", tmpdir.absolutePath
+                    flagFile, compilerId, daemonJVMOptions, daemonOptions, TestMessageCollector(),
+                    File(getSimpleScriptBaseDir(), "script.kts").absolutePath,
+                    "-Xreport-output-files", "-Xuse-fir-lt=false", "-Xallow-any-scripts-in-source-roots", "-d", tmpdir.absolutePath
                 )
                 Assert.assertEquals(0, code)
                 Assert.assertTrue(outputs.isNotEmpty())
diff --git a/compiler/tests/org/jetbrains/kotlin/integration/CompilerSmokeTest.java b/compiler/tests/org/jetbrains/kotlin/integration/CompilerSmokeTest.java
index b85a56689ed..287ca4f79a4 100644
--- a/compiler/tests/org/jetbrains/kotlin/integration/CompilerSmokeTest.java
+++ b/compiler/tests/org/jetbrains/kotlin/integration/CompilerSmokeTest.java
@@ -119,7 +119,7 @@ public class CompilerSmokeTest extends CompilerSmokeTestBase {
     public void testCompileScript() throws Exception {
         String jar = tmpdir.getAbsolutePath() + File.separator + "script.jar";
 
-        runCompiler("script", "-Xallow-any-scripts-in-source-roots", "script.kts", "-d", jar);
+        runCompiler("script", "-Xuse-fir-lt=false", "-Xallow-any-scripts-in-source-roots", "script.kts", "-d", jar);
     }
 
     public void testInlineOnly() throws Exception {
diff --git a/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingCompilerPluginTest.kt b/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingCompilerPluginTest.kt
index 4e4ed5a522b..2b040cfd2cc 100644
--- a/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingCompilerPluginTest.kt
+++ b/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingCompilerPluginTest.kt
@@ -201,7 +201,8 @@ class ScriptingCompilerPluginTest : TestCase() {
                 val cp = (runtimeClasspath + scriptingClasspath + defsOut).joinToString(File.pathSeparator)
                 val exitCode = K2JVMCompiler().exec(
                     System.err,
-                    "-cp", cp, *(scriptFiles.toTypedArray()), "-d", scriptsOut2.canonicalPath, "-Xallow-any-scripts-in-source-roots"
+                    "-cp", cp, *(scriptFiles.toTypedArray()), "-d", scriptsOut2.canonicalPath, "-Xallow-any-scripts-in-source-roots",
+                    "-Xuse-fir-lt=false"
                 )
 
                 Assert.assertEquals(ExitCode.OK, exitCode)
diff --git a/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingWithCliCompilerTest.kt b/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingWithCliCompilerTest.kt
index 02d56a816d0..432c3c999b4 100644
--- a/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingWithCliCompilerTest.kt
+++ b/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/plugin/ScriptingWithCliCompilerTest.kt
@@ -251,6 +251,7 @@ class ScriptingWithCliCompilerTest {
                         arrayOf(
                             "-P", "plugin:kotlin.scripting:disable-script-definitions-autoloading=true",
                             "-cp", getMainKtsClassPath().joinToString(File.pathSeparator), "-d", tmpdir.path,
+                            "-Xuse-fir-lt=false",
                             "-Xallow-any-scripts-in-source-roots", "-verbose", fileArg
                         )
                     )
diff --git a/prepare/compiler-client-embeddable/tests/kotlin/org/jetbrains/kotlin/compiler/client/CompilerClientIT.kt b/prepare/compiler-client-embeddable/tests/kotlin/org/jetbrains/kotlin/compiler/client/CompilerClientIT.kt
index 1dc94ee136b..7c0abe65f21 100644
--- a/prepare/compiler-client-embeddable/tests/kotlin/org/jetbrains/kotlin/compiler/client/CompilerClientIT.kt
+++ b/prepare/compiler-client-embeddable/tests/kotlin/org/jetbrains/kotlin/compiler/client/CompilerClientIT.kt
@@ -80,7 +80,7 @@ class CompilerClientIT {
     fun testSimpleScript() {
         val (out, code) = runCompiler(
                 "-cp", compilationClasspath.joinToString(File.pathSeparator) { it.canonicalPath },
-                "-Xallow-any-scripts-in-source-roots",
+                "-Xuse-fir-lt=false", "-Xallow-any-scripts-in-source-roots",
                 File("testData/scripts/simpleHelloWorld.kts").canonicalPath)
         assertEquals(0, code, "compilation failed:\n" + out + "\n")
     }