diff --git a/pkgs/applications/science/electronics/flatcam/default.nix b/pkgs/applications/science/electronics/flatcam/default.nix
index 5332eb291d6f..2235cf0b4a33 100644
--- a/pkgs/applications/science/electronics/flatcam/default.nix
+++ b/pkgs/applications/science/electronics/flatcam/default.nix
@@ -10,7 +10,7 @@
 , six
 , setuptools
 , dill
-, Rtree
+, rtree
 , pyopengl
 , vispy
 , ortools
@@ -55,7 +55,7 @@ buildPythonApplication rec {
     six
     setuptools
     dill
-    Rtree
+    rtree
     pyopengl
     vispy
     ortools