diff --git a/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp b/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp
index 1999094e..4a3b779c 100644
--- a/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp
+++ b/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp
@@ -253,7 +253,7 @@ RkISP1Path::generateConfiguration(const CameraSensor *sensor, const Size &size,
 
 CameraConfiguration::Status
 RkISP1Path::validate(const CameraSensor *sensor,
-		     std::optional<SensorConfiguration> &sensorConfig,
+		     const std::optional<SensorConfiguration> &sensorConfig,
 		     StreamConfiguration *cfg)
 {
 	const std::vector<unsigned int> &mbusCodes = sensor->mbusCodes();
diff --git a/src/libcamera/pipeline/rkisp1/rkisp1_path.h b/src/libcamera/pipeline/rkisp1/rkisp1_path.h
index ce9a5666..8461071f 100644
--- a/src/libcamera/pipeline/rkisp1/rkisp1_path.h
+++ b/src/libcamera/pipeline/rkisp1/rkisp1_path.h
@@ -45,7 +45,7 @@ public:
 						  const Size &resolution,
 						  StreamRole role);
 	CameraConfiguration::Status validate(const CameraSensor *sensor,
-					     std::optional<SensorConfiguration> &sensorConfig,
+					     const std::optional<SensorConfiguration> &sensorConfig,
 					     StreamConfiguration *cfg);
 
 	int configure(const StreamConfiguration &config,