diff --git a/invesalius/constants.py b/invesalius/constants.py
index 4485cd0..99bf168 100644
--- a/invesalius/constants.py
+++ b/invesalius/constants.py
@@ -151,4 +151,5 @@ folder=RAYCASTING_PRESETS_DIRECTORY= os.path.join("..", "presets", "raycasting")
 
 RAYCASTING_TYPES = [filename.split(".")[0] for filename in 
                     os.listdir(folder) if
-                    os.path.isfile(os.path.join(folder,filename))]
+                    os.path.isfile(os.path.join(folder,filename))] 
+RAYCASTING_TYPES.sort()
--
libgit2 0.21.2