diff --git a/core/js/setupchecks.js b/core/js/setupchecks.js
index 97c28a69f68..222b12b8f40 100644
--- a/core/js/setupchecks.js
+++ b/core/js/setupchecks.js
@@ -353,7 +353,7 @@
 							type: OC.SetupChecks.MESSAGE_TYPE_WARNING
 						})
 					}
-					if (data.isPhpMailerUsed) {
+					if (data.isPHPMailerUsed) {
 						messages.push({
 							msg: t(
 								'core',
diff --git a/settings/Controller/CheckSetupController.php b/settings/Controller/CheckSetupController.php
index 6d6c27ee8e6..4211b9b4c6c 100644
--- a/settings/Controller/CheckSetupController.php
+++ b/settings/Controller/CheckSetupController.php
@@ -527,7 +527,7 @@ Raw output
 		return [];
 	}
 
-	protected function isPhpMailerUsed(): bool {
+	protected function isPHPMailerUsed(): bool {
 		return $this->config->getSystemValue('mail_smtpmode', 'smtp') === 'php';
 	}
 
@@ -638,7 +638,7 @@ Raw output
 				'missingIndexes' => $this->hasMissingIndexes(),
 				'isSqliteUsed' => $this->isSqliteUsed(),
 				'databaseConversionDocumentation' => $this->urlGenerator->linkToDocs('admin-db-conversion'),
-				'isPhpMailerUsed' => $this->isPhpMailerUsed(),
+				'isPHPMailerUsed' => $this->isPHPMailerUsed(),
 				'mailSettingsDocumentation' => $this->urlGenerator->getAbsoluteURL('index.php/settings/admin'),
 				'isMemoryLimitSufficient' => $this->memoryInfo->isMemoryLimitSufficient(),
 				'appDirsWithDifferentOwner' => $this->getAppDirsWithDifferentOwner(),
diff --git a/tests/Settings/Controller/CheckSetupControllerTest.php b/tests/Settings/Controller/CheckSetupControllerTest.php
index e85750f6b14..360bd27f254 100644
--- a/tests/Settings/Controller/CheckSetupControllerTest.php
+++ b/tests/Settings/Controller/CheckSetupControllerTest.php
@@ -155,7 +155,7 @@ class CheckSetupControllerTest extends TestCase {
 				'hasFreeTypeSupport',
 				'hasMissingIndexes',
 				'isSqliteUsed',
-				'isPhpMailerUsed',
+				'isPHPMailerUsed',
 				'hasOpcacheLoaded',
 				'getAppDirsWithDifferentOwner',
 				'hasRecommendedPHPModules',
@@ -473,7 +473,7 @@ class CheckSetupControllerTest extends TestCase {
 			]);
 		$this->checkSetupController
 			->expects($this->once())
-			->method('isPhpMailerUsed')
+			->method('isPHPMailerUsed')
 			->willReturn(false);
 		$this->checker
 			->expects($this->once())
@@ -531,7 +531,7 @@ class CheckSetupControllerTest extends TestCase {
 				'isSqliteUsed' => false,
 				'databaseConversionDocumentation' => 'http://docs.example.org/server/go.php?to=admin-db-conversion',
 				'missingIndexes' => [],
-				'isPhpMailerUsed' => false,
+				'isPHPMailerUsed' => false,
 				'mailSettingsDocumentation' => 'https://server/index.php/settings/admin',
 				'isMemoryLimitSufficient' => true,
 				'appDirsWithDifferentOwner' => [],
@@ -541,7 +541,7 @@ class CheckSetupControllerTest extends TestCase {
 		$this->assertEquals($expected, $this->checkSetupController->check());
 	}
 
-	public function testIsPhpMailerUsed() {
+	public function testIsPHPMailerUsed() {
 		$checkSetupController = $this->getMockBuilder('\OC\Settings\Controller\CheckSetupController')
 			->setConstructorArgs([
 				'settings',
@@ -571,8 +571,8 @@ class CheckSetupControllerTest extends TestCase {
 			->with('mail_smtpmode', 'smtp')
 			->will($this->returnValue('not-php'));
 
-		$this->assertTrue($this->invokePrivate($checkSetupController, 'isPhpMailerUsed'));
-		$this->assertFalse($this->invokePrivate($checkSetupController, 'isPhpMailerUsed'));
+		$this->assertTrue($this->invokePrivate($checkSetupController, 'isPHPMailerUsed'));
+		$this->assertFalse($this->invokePrivate($checkSetupController, 'isPHPMailerUsed'));
 	}
 
 	public function testGetCurlVersion() {