diff --git a/src/Symfony/Component/ErrorHandler/DebugClassLoader.php b/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
index bb35bdc29e..79ab0b07d6 100644
--- a/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
+++ b/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
@@ -13,6 +13,7 @@ namespace Symfony\Component\ErrorHandler;
 
 use Doctrine\Common\Persistence\Proxy as LegacyProxy;
 use Doctrine\Persistence\Proxy;
+use Mockery\MockInterface;
 use PHPUnit\Framework\MockObject\Matcher\StatelessInvocation;
 use PHPUnit\Framework\MockObject\MockObject;
 use Prophecy\Prophecy\ProphecySubjectInterface;
@@ -306,6 +307,7 @@ class DebugClassLoader
                     && !is_subclass_of($symbols[$i], Proxy::class)
                     && !is_subclass_of($symbols[$i], ProxyInterface::class)
                     && !is_subclass_of($symbols[$i], LegacyProxy::class)
+                    && !is_subclass_of($symbols[$i], MockInterface::class)
                 ) {
                     $loader->checkClass($symbols[$i]);
                 }