diff --git a/api/ApiAbuseFilterCheckMatch.php b/api/ApiAbuseFilterCheckMatch.php
index 5490cc9e5..7f6279265 100644
--- a/api/ApiAbuseFilterCheckMatch.php
+++ b/api/ApiAbuseFilterCheckMatch.php
@@ -7,7 +7,7 @@ class ApiAbuseFilterCheckMatch extends ApiBase {
 
 		// "Anti-DoS"
 		if ( !$this->getUser()->isAllowed( 'abusefilter-modify' ) ) {
-			$this->dieUsageMsg( 'permissiondenied' );
+			$this->dieUsage( 'You don\'t have permission to test abuse filters', 'permissiondenied' );
 		}
 
 		if ( $params['vars'] ) {
@@ -93,7 +93,7 @@ class ApiAbuseFilterCheckMatch extends ApiBase {
 		return array_merge( parent::getPossibleErrors(),
 			$this->getRequireOnlyOneParameterErrorMessages( array( 'vars', 'rcid', 'logid' ) ),
 			array(
-				array( 'permissiondenied' ),
+				array( 'code' => 'permissiondenied', 'info' => 'You don\'t have permission to test abuse filters' ),
 				array( 'nosuchrcid' ),
 				array( 'code' => 'nosuchlogid', 'info' => 'There is no abuselog entry with the id given' ),
 				array( 'code' => 'badsyntax', 'info' => 'The filter has invalid syntax' ),
diff --git a/api/ApiAbuseFilterCheckSyntax.php b/api/ApiAbuseFilterCheckSyntax.php
index 379253ea2..5b89eeb1d 100644
--- a/api/ApiAbuseFilterCheckSyntax.php
+++ b/api/ApiAbuseFilterCheckSyntax.php
@@ -5,7 +5,7 @@ class ApiAbuseFilterCheckSyntax extends ApiBase {
 	public function execute() {
 		// "Anti-DoS"
 		if ( !$this->getUser()->isAllowed( 'abusefilter-modify' ) ) {
-			$this->dieUsageMsg( 'permissiondenied' );
+			$this->dieUsage( 'You don\'t have permission to check syntax of abuse filters', 'permissiondenied' );
 		}
 
 		$params = $this->extractRequestParams();
@@ -48,7 +48,7 @@ class ApiAbuseFilterCheckSyntax extends ApiBase {
 
 	public function getPossibleErrors() {
 		return array_merge( parent::getPossibleErrors(), array(
-			array( 'permissiondenied' ),
+			array( 'code' => 'permissiondenied', 'info' => 'You don\'t have permission to check syntax of abuse filters' ),
 		) );
 	}