diff --git a/Sources/ProjectSpec/Scheme.swift b/Sources/ProjectSpec/Scheme.swift
index 6e2faea2..a476b71a 100644
--- a/Sources/ProjectSpec/Scheme.swift
+++ b/Sources/ProjectSpec/Scheme.swift
@@ -640,6 +640,7 @@ extension Scheme.Test: JSONEncodable {
             "language": language,
             "region": region,
             "coverageTargets": coverageTargets.map { $0.reference },
+            "macroExpansion": macroExpansion
         ]
 
         if gatherCoverageData != Scheme.Test.gatherCoverageDataDefault {