diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index d2679a4b..c9a19b02 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -277,6 +277,12 @@ int CameraSensor::init()
 	 */
 	resolution_ = sizes_.back();
 
+	/*
+	 * Set a default value for the SensorOutputSize, though it will have to
+	 * be updated when new camera modes are chosen.
+	 */
+	properties_.set(properties::SensorOutputSize, resolution_);
+
 	return 0;
 }