diff --git a/flextype/core/Entries.php b/flextype/core/Entries.php
index 1c6d25fa..47b11eaa 100755
--- a/flextype/core/Entries.php
+++ b/flextype/core/Entries.php
@@ -27,6 +27,7 @@ use function rtrim;
 use function str_replace;
 use function strpos;
 use function time;
+use function strtotime;
 
 class Entries
 {