diff --git a/src/filter/mod.rs b/src/filter/mod.rs
index 1513278..b7a58ab 100644
--- a/src/filter/mod.rs
+++ b/src/filter/mod.rs
@@ -65,6 +65,7 @@ mod tests {
 
     #[test]
     fn test_paditer() {
+        register_all();
         assert_eq!(
             find("overlay")
                 .unwrap()