diff --git a/pkgs/applications/science/math/sage/threejs-sage.nix b/pkgs/applications/science/math/sage/threejs-sage.nix
index 0e4ad4dee955..bc7230f333ab 100644
--- a/pkgs/applications/science/math/sage/threejs-sage.nix
+++ b/pkgs/applications/science/math/sage/threejs-sage.nix
@@ -12,7 +12,8 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/lib/node_modules/three
-    cp -r build version $out/lib/node_modules/three
+    mkdir -p "$out/lib/node_modules/three/"
+    cp version "$out/lib/node_modules/three"
+    cp -r build "$out/lib/node_modules/three/$(cat version)"
   '';
 }