diff --git a/include/libcamera/internal/pipeline_handler.h b/include/libcamera/internal/pipeline_handler.h
index 22e629a8401d1e4e..d5321ef56df358d0 100644
--- a/include/libcamera/internal/pipeline_handler.h
+++ b/include/libcamera/internal/pipeline_handler.h
@@ -96,7 +96,7 @@ protected:
 
 	virtual int queueRequestDevice(Camera *camera, Request *request) = 0;
 
-	CameraData *cameraData(const Camera *camera);
+	CameraData *cameraData(const Camera *camera) const;
 
 	CameraManager *manager_;
 
diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp
index ccd45edc847b9e3f..bc9c1d4b09c5437d 100644
--- a/src/libcamera/pipeline_handler.cpp
+++ b/src/libcamera/pipeline_handler.cpp
@@ -595,10 +595,10 @@ void PipelineHandler::disconnect()
  * valid until the pipeline handler is destroyed. It shall not be deleted
  * manually by the caller.
  */
-CameraData *PipelineHandler::cameraData(const Camera *camera)
+CameraData *PipelineHandler::cameraData(const Camera *camera) const
 {
 	ASSERT(cameraData_.count(camera));
-	return cameraData_[camera].get();
+	return cameraData_.at(camera).get();
 }
 
 /**