diff --git a/ext/session/mod_files.c b/ext/session/mod_files.c
index 9ca57b7eac5..87752bf2118 100644
--- a/ext/session/mod_files.c
+++ b/ext/session/mod_files.c
@@ -136,8 +136,10 @@ static void ps_files_open(ps_files *data, const char *key TSRMLS_DC)
 		ps_files_close(data);
 		
 		if (!ps_files_valid_key(key) || 
-				!ps_files_path_create(buf, sizeof(buf), data, key))
+			!ps_files_path_create(buf, sizeof(buf), data, key)) {
+			data->fd = -1;
 			return;
+		}
 		
 		data->lastkey = estrdup(key);