diff --git a/lib/Doctrine/PSRCacheInvalidArgumentException.php b/lib/Doctrine/PSRCacheInvalidArgumentException.php
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/lib/Doctrine/PSRCacheItem.php b/lib/Doctrine/PSRCacheItem.php
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/lib/Doctrine/PSRMetadataCache.php b/lib/Doctrine/PSRMetadataCache.php
new file mode 100644
index 0000000000..e69de29bb2