diff --git a/cmd/osbuild-worker/jobimpl-koji-finalize.go b/cmd/osbuild-worker/jobimpl-koji-finalize.go
index a63edf00f..e75ca712a 100644
--- a/cmd/osbuild-worker/jobimpl-koji-finalize.go
+++ b/cmd/osbuild-worker/jobimpl-koji-finalize.go
@@ -208,8 +208,8 @@ func (impl *KojiFinalizeJobImpl) Run(job worker.Job) error {
 		// If there are any non-Koji target results in the build,
 		// add them to the image output extra metadata.
 		nonKojiTargetResults := buildResult.TargetResultsFilterByName([]target.TargetName{target.TargetNameKoji})
-		if len(nonKojiTargetResults) > 0 {
-			imgOutputExtraInfo.UploadTargetResults = nonKojiTargetResults
+		for _, result := range nonKojiTargetResults {
+			imgOutputExtraInfo.UploadTargetResults = append(imgOutputExtraInfo.UploadTargetResults, result)
 		}
 
 		imgOutputsExtraInfo[imageFilename] = imgOutputExtraInfo
diff --git a/internal/upload/koji/metadata.go b/internal/upload/koji/metadata.go
index 55b5b973f..8f947fbe5 100644
--- a/internal/upload/koji/metadata.go
+++ b/internal/upload/koji/metadata.go
@@ -98,8 +98,9 @@ type ImageExtraInfo struct {
 	// Version of the osbuild binary used by the worker to build the image
 	OSBuildVersion string `json:"osbuild_version,omitempty"`
 	// Results from any upload targets associated with the image
-	// except for the Koji target.
-	UploadTargetResults []*target.TargetResult `json:"upload_target_results,omitempty"`
+	// The structure of the data does not need to be known by the consumer,
+	// it is just a list of JSON objects.
+	UploadTargetResults []interface{} `json:"upload_target_results,omitempty"`
 }
 
 func (ImageExtraInfo) isImageOutputTypeMD() {}