diff --git a/src/Psalm/Internal/Analyzer/IssueData.php b/src/Psalm/Internal/Analyzer/IssueData.php
index fa38f4fc1cc..4db99befce1 100644
--- a/src/Psalm/Internal/Analyzer/IssueData.php
+++ b/src/Psalm/Internal/Analyzer/IssueData.php
@@ -119,7 +119,7 @@ class IssueData
      * @var ?string
      * @readonly
      */
-    private $dupe_key;
+    public $dupe_key;
 
     /**
      * @param ?list<ControlFlowNodeData|array{label: string, entry_path_type: string}> $taint_trace
@@ -166,9 +166,4 @@ public function __construct(
         $this->taint_trace = $taint_trace;
         $this->dupe_key = $dupe_key;
     }
-
-    public function getDupeKey() : ?string
-    {
-        return $this->dupe_key;
-    }
 }
diff --git a/src/Psalm/IssueBuffer.php b/src/Psalm/IssueBuffer.php
index da024297d7b..b7b147afb4c 100644
--- a/src/Psalm/IssueBuffer.php
+++ b/src/Psalm/IssueBuffer.php
@@ -412,7 +412,7 @@ public static function addIssues(array $issues_data): void
                     . '-' . $issue->file_name
                     . ':' . $issue->line_from
                     . ':' . $issue->column_from
-                    . ' ' . $issue->getDupeKey();
+                    . ' ' . $issue->dupe_key;
 
                 if (!self::alreadyEmitted($emitted_key)) {
                     self::$issues_data[$file_path][] = $issue;
diff --git a/src/Psalm/Report/JsonReport.php b/src/Psalm/Report/JsonReport.php
index f867058e26e..fdca5b25dde 100644
--- a/src/Psalm/Report/JsonReport.php
+++ b/src/Psalm/Report/JsonReport.php
@@ -13,6 +13,15 @@ public function create(): string
     {
         $options = $this->pretty ? Json::PRETTY : Json::DEFAULT;
 
-        return Json::encode(array_values($this->issues_data), $options) . "\n";
+        $issues_data = \array_map(
+            function ($issue_data): array {
+                $issue_data = (array) $issue_data;
+                unset($issue_data['dupe_key']);
+                return $issue_data;
+            },
+            $this->issues_data
+        );
+
+        return Json::encode(array_values($issues_data), $options) . "\n";
     }
 }
diff --git a/src/Psalm/Report/XmlReport.php b/src/Psalm/Report/XmlReport.php
index 86b0b946445..24cc6fc2687 100644
--- a/src/Psalm/Report/XmlReport.php
+++ b/src/Psalm/Report/XmlReport.php
@@ -15,7 +15,9 @@ public function create(): string
             [
                 'item' => array_map(
                     function (IssueData $issue_data): array {
-                        return (array) $issue_data;
+                        $issue_data = (array) $issue_data;
+                        unset($issue_data['dupe_key']);
+                        return $issue_data;
                     },
                     $this->issues_data
                 )