diff --git a/src/main/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPlugin.groovy b/src/main/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPlugin.groovy
index 5c412534..4bcc5903 100644
--- a/src/main/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPlugin.groovy
+++ b/src/main/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPlugin.groovy
@@ -75,6 +75,10 @@ class OspackageApplicationSpringBootPlugin implements Plugin<Project> {
                         }
                     }
                 }
+                // Allow the springBoot extension configuration to propagate to the application plugin
+                if (!project.application.mainClass.isPresent()) {
+                    project.application.mainClass.set(project.springBoot.mainClassName)
+                }
             }
         } else {
             project.tasks.getByName(DistributionPlugin.TASK_INSTALL_NAME).dependsOn('bootRepackage')
diff --git a/src/test/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPluginLauncherSpec.groovy b/src/test/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPluginLauncherSpec.groovy
index dd45cacb..6e3927ca 100644
--- a/src/test/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPluginLauncherSpec.groovy
+++ b/src/test/groovy/com/netflix/gradle/plugins/application/OspackageApplicationSpringBootPluginLauncherSpec.groovy
@@ -122,6 +122,31 @@ class OspackageApplicationSpringBootPluginLauncherSpec extends IntegrationSpec {
         '2.4.2'     | _
     }
 
+    @Unroll
+    def 'application runs for boot #bootVersion when mainClassName configured using springBoot extension'() {
+        final applicationDir = "$moduleName-boot"
+        final startScript = file("build/install/$applicationDir/bin/$moduleName")
+
+        buildFile << buildScript(bootVersion, startScript)
+        buildFile << """
+        mainClassName = null
+
+        springBoot {
+            mainClassName = 'nebula.test.HelloWorld'
+        }
+        """
+
+        when:
+        def result = runTasksSuccessfully('runStartScript')
+
+        then:
+        result.standardOutput.contains('Hello Integration Test')
+
+        where:
+        bootVersion | _
+        '2.4.2'     | _
+    }
+
     @Unroll
     def 'can customize destination for boot #bootVersion'() {
         buildFile << buildScript(bootVersion, null)