diff --git a/include/libcamera/internal/camera_sensor.h b/include/libcamera/internal/camera_sensor.h
index 7fb4ededb..b9f4d7867 100644
--- a/include/libcamera/internal/camera_sensor.h
+++ b/include/libcamera/internal/camera_sensor.h
@@ -43,7 +43,7 @@ public:
 	const std::string &id() const { return id_; }
 	const MediaEntity *entity() const { return entity_; }
 	const std::vector<unsigned int> &mbusCodes() const { return mbusCodes_; }
-	const std::vector<Size> sizes(unsigned int mbusCode) const;
+	std::vector<Size> sizes(unsigned int mbusCode) const;
 	Size resolution() const;
 	const std::vector<controls::draft::TestPatternModeEnum> &testPatternModes() const
 	{
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 8b4406fe8..eaa2da6ba 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -526,7 +526,7 @@ int CameraSensor::discoverAncillaryDevices()
  *
  * \return The supported frame sizes for \a mbusCode sorted in increasing order
  */
-const std::vector<Size> CameraSensor::sizes(unsigned int mbusCode) const
+std::vector<Size> CameraSensor::sizes(unsigned int mbusCode) const
 {
 	std::vector<Size> sizes;