diff --git a/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-ant/build.gradle b/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-ant/build.gradle
index 692750679b..7ff1740185 100644
--- a/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-ant/build.gradle
+++ b/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-ant/build.gradle
@@ -50,7 +50,7 @@ task syncTestRepository(type: Sync) {
 task antRun(type: JavaExec) {
 	dependsOn syncTestRepository, configurations.antDependencies
 	classpath = configurations.antDependencies;
-	main = "org.apache.tools.ant.launch.Launcher"
+	mainClass = "org.apache.tools.ant.launch.Launcher"
 	args = [ "clean", "build" ]
 	systemProperties = [
 		"ant-spring-boot.version" : version,