diff --git a/src/cache/signature.rs b/src/cache/signature.rs
index 33447f3a..650246f0 100644
--- a/src/cache/signature.rs
+++ b/src/cache/signature.rs
@@ -181,6 +181,7 @@ mod tests {
             }],
             log: None,
             aster_version: "0.21.0".to_string(),
+            packs: Vec::new(),
         }
     }