diff --git a/src/Illuminate/Http/Client/RequestException.php b/src/Illuminate/Http/Client/RequestException.php
index 6f32fc9f64a0..d871e091adbe 100644
--- a/src/Illuminate/Http/Client/RequestException.php
+++ b/src/Illuminate/Http/Client/RequestException.php
@@ -16,7 +16,7 @@ class RequestException extends HttpClientException
     /**
      * The current truncation length for the exception message.
      *
-     * @var int|false
+     * @var int|false|null
      */
     public $truncateExceptionsAt;
 
@@ -27,6 +27,13 @@ class RequestException extends HttpClientException
      */
     public static $truncateAt = 120;
 
+    /**
+     * Whether the response has been summarized in the message.
+     *
+     * @var bool
+     */
+    public $hasBeenSummarized = false;
+
     /**
      * Create a new exception instance.
      *
@@ -35,7 +42,7 @@ class RequestException extends HttpClientException
      */
     public function __construct(Response $response, $truncateExceptionsAt = null)
     {
-        parent::__construct("HTTP request returned status code {$response->status()}", $response->status());
+        parent::__construct($this->prepareMessage($response), $response->status());
 
         $this->truncateExceptionsAt = $truncateExceptionsAt;
 
@@ -76,18 +83,35 @@ public static function dontTruncate()
     /**
      * Prepare the exception message.
      *
-     * @return void
+     * @param  \Illuminate\Http\Client\Response  $response
+     * @return string
      */
-    public function report(): void
+    protected function prepareMessage(Response $response)
     {
+        $message = "HTTP request returned status code {$response->status()}";
+
         $truncateExceptionsAt = $this->truncateExceptionsAt ?? static::$truncateAt;
 
-        $summary = $truncateExceptionsAt
-            ? Message::bodySummary($this->response->toPsrResponse(), $truncateExceptionsAt)
-            : Message::toString($this->response->toPsrResponse());
+        $summary = is_int($truncateExceptionsAt)
+            ? Message::bodySummary($response->toPsrResponse(), $truncateExceptionsAt)
+            : Message::toString($response->toPsrResponse());
+
+        return is_null($summary) ? $message : $message . ":\n{$summary}\n";
+    }
 
-        if (! is_null($summary)) {
-            $this->message .= ":\n{$summary}\n";
+    /**
+     * Prepare the exception message.
+     *
+     * @return void
+     */
+    public function report(): void
+    {
+        if ($this->hasBeenSummarized) {
+            return;
         }
+
+        $this->message = $this->prepareMessage($this->response);
+
+        $this->hasBeenSummarized = true;
     }
 }
diff --git a/tests/Http/HttpClientTest.php b/tests/Http/HttpClientTest.php
index 39c059dc9bd1..e23f0ee9fca4 100644
--- a/tests/Http/HttpClientTest.php
+++ b/tests/Http/HttpClientTest.php
@@ -1452,6 +1452,26 @@ public function testRequestExceptionEmptyBody()
         throw new RequestException(new Response($response));
     }
 
+    public function testReportingExceptionTwiceDoesNotIncludeSummaryTwice()
+    {
+        RequestException::dontTruncate();
+
+        $error = [
+            'error' => [
+                'code' => 403,
+                'message' => 'The Request can not be completed',
+            ],
+        ];
+
+        $response = new Psr7Response(403, [], json_encode($error));
+
+        $exception = new RequestException(new Response($response));
+        $exception->report();
+        $exception->report();
+
+        $this->assertEquals(1, substr_count($exception->getMessage(), '{"error":{"code":403,"message":"The Request can not be completed"}}')); 
+    }
+
     public function testOnErrorDoesntCallClosureOnInformational()
     {
         $status = 0;