diff --git a/src/fd_static_cache.erl b/src/fd_static_cache.erl
index 472f705..5c3985f 100644
--- a/src/fd_static_cache.erl
+++ b/src/fd_static_cache.erl
@@ -16,6 +16,11 @@
 
 -include("$zx_include/zx_logger.hrl").
 
+-record(f, {http_path     :: binary(),
+            fs_path       :: file:filename(),
+            last_modified :: file:date_time(),
+            mime_type     :: string(),
+            contents      :: binary()}).
 -type context() :: wfc_eval_context:context().
 
 -record(s,