diff --git a/mithril-signer/src/services/aggregator_client.rs b/mithril-signer/src/services/aggregator_client.rs
index 0b69abe109..a464fb6032 100644
--- a/mithril-signer/src/services/aggregator_client.rs
+++ b/mithril-signer/src/services/aggregator_client.rs
@@ -1106,10 +1106,9 @@ mod tests {
                     .expect("Accept-Encoding header not found");
 
                 let header_value = accept_encoding_header.clone().1;
-                header_value.contains("gzip")
-                    && header_value.contains("br")
-                    && header_value.contains("deflate")
-                    && header_value.contains("zstd")
+                ["gzip", "br", "deflate", "zstd"]
+                    .iter()
+                    .all(|&value| header_value.contains(value))
             });
 
             then.status(201);