diff --git a/src/libcamera/pipeline/rkisp1/rkisp1.cpp b/src/libcamera/pipeline/rkisp1/rkisp1.cpp
index 549f4a4e61a8..c3d390f775f2 100644
--- a/src/libcamera/pipeline/rkisp1/rkisp1.cpp
+++ b/src/libcamera/pipeline/rkisp1/rkisp1.cpp
@@ -362,7 +362,7 @@ void RkISP1CameraData::metadataReady(unsigned int frame, const ControlList &meta
 	if (!info)
 		return;
 
-	info->request->metadata() = metadata;
+	info->request->metadata().merge(const_cast<ControlList &>(metadata));
 	info->metadataProcessed = true;
 
 	pipe->tryCompleteRequest(info->request);