diff --git a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
index 4c086c3d55..a045a5d5a1 100644
--- a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
@@ -74,7 +74,11 @@ class ChainAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
                 $item->metadata = $item->newMetadata = $sourceItem->metadata = $sourceMetadata;
 
                 if (isset($item->metadata[CacheItem::METADATA_EXPIRY])) {
-                    $item->expiresAt(\DateTime::createFromFormat('U.u', $item->metadata[CacheItem::METADATA_EXPIRY]));
+                    if (\is_int($expiry = $item->metadata[CacheItem::METADATA_EXPIRY])) {
+                        $item->expiresAt(\DateTime::createFromFormat('U', $expiry));
+                    } else {
+                        $item->expiresAt(\DateTime::createFromFormat('U.u', sprintf('%.3F', $expiry)));
+                    }
                 } elseif (0 < $defaultLifetime) {
                     $item->expiresAfter($defaultLifetime);
                 }