diff --git a/boa_tester/src/main.rs b/boa_tester/src/main.rs
index a020644f4e7..8a600a8f852 100644
--- a/boa_tester/src/main.rs
+++ b/boa_tester/src/main.rs
@@ -361,11 +361,10 @@ impl Add for Statistics {
 struct SuiteResult {
     #[serde(rename = "n")]
     name: Box<str>,
-    #[serde(rename = "a")]
     all_stats: Statistics,
-    #[serde(rename = "a5")]
+    #[serde(rename = "a5", default)]
     es5_stats: Statistics,
-    #[serde(rename = "a6")]
+    #[serde(rename = "a6", default)]
     es6_stats: Statistics,
     #[serde(skip_serializing_if = "Vec::is_empty", default)]
     #[serde(rename = "s")]
diff --git a/boa_tester/src/results.rs b/boa_tester/src/results.rs
index 13875904496..8bff68136e4 100644
--- a/boa_tester/src/results.rs
+++ b/boa_tester/src/results.rs
@@ -27,11 +27,10 @@ struct ReducedResultInfo {
     commit: Box<str>,
     #[serde(rename = "u")]
     test262_commit: Box<str>,
-    #[serde(rename = "a")]
     all_stats: Statistics,
-    #[serde(rename = "a5")]
+    #[serde(rename = "a5", default)]
     es5_stats: Statistics,
-    #[serde(rename = "a6")]
+    #[serde(rename = "a6", default)]
     es6_stats: Statistics,
 }