diff --git a/analysis/analysis-api-fir/analysis-api-fir-generator/build.gradle.kts b/analysis/analysis-api-fir/analysis-api-fir-generator/build.gradle.kts
index fd48d9c28be..a38a11bfe0f 100644
--- a/analysis/analysis-api-fir/analysis-api-fir-generator/build.gradle.kts
+++ b/analysis/analysis-api-fir/analysis-api-fir-generator/build.gradle.kts
@@ -30,7 +30,7 @@ val writeCopyright by task<tasks.WriteCopyrightToFile> {
 }
 
 application {
-    mainClassName = "org.jetbrains.kotlin.analysis.api.fir.generator.MainKt"
+    mainClass.set("org.jetbrains.kotlin.analysis.api.fir.generator.MainKt")
 }
 
 val processResources by tasks
diff --git a/compiler/fir/checkers/checkers-component-generator/build.gradle.kts b/compiler/fir/checkers/checkers-component-generator/build.gradle.kts
index 06a01c5d001..b1e2a113a35 100644
--- a/compiler/fir/checkers/checkers-component-generator/build.gradle.kts
+++ b/compiler/fir/checkers/checkers-component-generator/build.gradle.kts
@@ -28,7 +28,7 @@ val writeCopyright by task<tasks.WriteCopyrightToFile> {
 }
 
 application {
-    mainClassName = "org.jetbrains.kotlin.fir.checkers.generator.MainKt"
+    mainClass.set("org.jetbrains.kotlin.fir.checkers.generator.MainKt")
 }
 
 val processResources by tasks
diff --git a/compiler/fir/tree/tree-generator/build.gradle.kts b/compiler/fir/tree/tree-generator/build.gradle.kts
index 178e7568749..c4d693bab6d 100644
--- a/compiler/fir/tree/tree-generator/build.gradle.kts
+++ b/compiler/fir/tree/tree-generator/build.gradle.kts
@@ -28,7 +28,7 @@ val writeCopyright by task<WriteCopyrightToFile> {
 }
 
 application {
-    mainClassName = "org.jetbrains.kotlin.fir.tree.generator.MainKt"
+    mainClass.set("org.jetbrains.kotlin.fir.tree.generator.MainKt")
 }
 
 val processResources by tasks
diff --git a/compiler/tests-mutes/tc-integration/build.gradle.kts b/compiler/tests-mutes/tc-integration/build.gradle.kts
index f80ceea9d5b..83e6146e740 100644
--- a/compiler/tests-mutes/tc-integration/build.gradle.kts
+++ b/compiler/tests-mutes/tc-integration/build.gradle.kts
@@ -19,6 +19,6 @@ sourceSets {
 val mutesPackageName = "org.jetbrains.kotlin.test.mutes"
 
 application {
-    mainClassName = "$mutesPackageName.MutedTestsSyncKt"
+    mainClass.set("$mutesPackageName.MutedTestsSyncKt")
     applicationDefaultJvmArgs = rootProject.properties.filterKeys { it.startsWith(mutesPackageName) }.map { (k, v) -> "-D$k=$v" }
 }