diff --git a/composer.json b/composer.json
index f558a7d79..605520f92 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
 	},
 	"require-dev": {
 		"mediawiki/mediawiki-codesniffer": "38.0.0",
-		"mediawiki/mediawiki-phan-config": "0.11.0",
+		"mediawiki/mediawiki-phan-config": "0.11.1",
 		"mediawiki/minus-x": "1.1.1",
 		"php-parallel-lint/php-console-highlighter": "0.5.0",
 		"php-parallel-lint/php-parallel-lint": "1.3.1"
diff --git a/includes/FilterValidator.php b/includes/FilterValidator.php
index ffd93e834..b2d563c11 100644
--- a/includes/FilterValidator.php
+++ b/includes/FilterValidator.php
@@ -252,6 +252,7 @@ class FilterValidator {
 			foreach ( $throttleGroups as $group ) {
 				if ( strpos( $group, ',' ) !== false ) {
 					$subGroups = explode( ',', $group );
+					// @phan-suppress-next-line PhanPossiblyUndeclaredVariable
 					if ( $subGroups !== array_unique( $subGroups ) ) {
 						$uniqueSubGroups = false;
 						break;