diff --git a/src/libcamera/pipeline/ipu3/cio2.h b/src/libcamera/pipeline/ipu3/cio2.h
index f905d97fa79d..0f75b0bc4572 100644
--- a/src/libcamera/pipeline/ipu3/cio2.h
+++ b/src/libcamera/pipeline/ipu3/cio2.h
@@ -49,7 +49,7 @@ public:
 	int start();
 	int stop();
 
-	CameraSensor *sensor() { return sensor_; }
+	CameraSensor *sensor() const { return sensor_; }
 
 	int queueBuffer(Request *request, FrameBuffer *rawBuffer);
 	void tryReturnBuffer(FrameBuffer *buffer);