diff --git a/src/Psalm/Report/ByIssueSeverityReport.php b/src/Psalm/Report/ByIssueSeverityReport.php
index d1d6e2122ce..c9eb684ef3e 100644
--- a/src/Psalm/Report/ByIssueSeverityReport.php
+++ b/src/Psalm/Report/ByIssueSeverityReport.php
@@ -156,7 +156,7 @@ private function getFileReference($data): string
         return "\033]8;;" . $link . "\033\\" . $reference . "\033]8;;\033\\";
     }
 
-    public function sortIssuesByLevelAndType(): void
+    private function sortIssuesByLevelAndType(): void
     {
         usort($this->issues_data, function (IssueData $left, IssueData $right): int {
             $leftLevel = $left->error_level;