diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index 4cedff27eb56c..19f8f5e1e84f5 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -217,7 +217,7 @@ public function __construct(?string $content = '', int $status = 200, array $hea
     public function __toString(): string
     {
         return
-            $this->getCommandString()."\r\n".
+            sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText)."\r\n".
             $this->headers."\r\n".
             $this->getContent();
     }
@@ -230,14 +230,6 @@ public function __clone()
         $this->headers = clone $this->headers;
     }
 
-    /**
-     * @return string The first line of the actual HTTP request
-     */
-    public function getCommandString(): string
-    {
-        return sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText);
-    }
-
     /**
      * Prepares the Response before it is sent to the client.
      *
diff --git a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsRedirected.php b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsRedirected.php
index ba40e1b89c944..b1abd905e4248 100644
--- a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsRedirected.php
+++ b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsRedirected.php
@@ -49,7 +49,7 @@ protected function additionalFailureDescription($other): string
         if ($this->verbose || !($other instanceof Response)) {
             return (string) $other;
         } else {
-            return $other->getCommandString()."\r\n".$other->headers;
+            return explode("\r\n\r\n", (string) $other)[0];
         }
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsSuccessful.php b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsSuccessful.php
index fa675e6a1950a..d7d6c502a17cb 100644
--- a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsSuccessful.php
+++ b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsSuccessful.php
@@ -49,7 +49,7 @@ protected function additionalFailureDescription($other): string
         if ($this->verbose || !($other instanceof Response)) {
             return (string) $other;
         } else {
-            return $other->getCommandString()."\r\n".$other->headers;
+            return explode("\r\n\r\n", (string) $other)[0];
         }
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsUnprocessable.php b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsUnprocessable.php
index 7823aa78666c1..c791a31bd63cb 100644
--- a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsUnprocessable.php
+++ b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseIsUnprocessable.php
@@ -49,7 +49,7 @@ protected function additionalFailureDescription($other): string
         if ($this->verbose || !($other instanceof Response)) {
             return (string) $other;
         } else {
-            return $other->getCommandString()."\r\n".$other->headers;
+            return explode("\r\n\r\n", (string) $other)[0];
         }
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseStatusCodeSame.php b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseStatusCodeSame.php
index 458517293f5a4..8259e09fdf2f0 100644
--- a/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseStatusCodeSame.php
+++ b/src/Symfony/Component/HttpFoundation/Test/Constraint/ResponseStatusCodeSame.php
@@ -49,7 +49,7 @@ protected function additionalFailureDescription($other): string
         if ($this->verbose || !($other instanceof Response)) {
             return (string) $other;
         } else {
-            return $other->getCommandString()."\r\n".$other->headers;
+            return explode("\r\n\r\n", (string) $other)[0];
         }
     }
 }