diff --git a/rq_controller/common/projection.py b/rq_controller/common/projection.py
index b80279406207a9e3d69950bd85749495464075d5..e372c9eaf5e4da3bbb70d1b0819001b9e2331b42 100644
--- a/rq_controller/common/projection.py
+++ b/rq_controller/common/projection.py
@@ -66,7 +66,7 @@ class PyProjection(PyProjectionGeometry):
                    detector_heigth_mm, detector_width_mm, frame_id, focal_spot_orientation,
                    voltage_kv, current_ua, exposure_time_ms)
     
-    def as_message(self) -> ProjectionGeometry:
+    def as_message(self) -> Projection:
         message = Projection()
         projection_geometry = ProjectionGeometry()