diff --git a/my-tools/generate_wbv2_geometry_fixture.py b/my-tools/generate_wbv2_geometry_fixture.py
index eff7111d4..350f956be 100644
--- a/my-tools/generate_wbv2_geometry_fixture.py
+++ b/my-tools/generate_wbv2_geometry_fixture.py
@@ -22,8 +22,8 @@ def main() -> int:
     if output.is_absolute() or ".." in output.parts or output.suffix != ".blend" or not str(output).startswith("tests/files/web/"):
         parser.error("--output must be a repository-relative .blend path under tests/files/web/")
     nodes = list(dict.fromkeys(args.node))
-    if not nodes or any(not node.startswith("GeometryNode") or not node.replace("_", "").isalnum() for node in nodes):
-        parser.error("every --node must be a Blender GeometryNode identifier")
+    if not nodes or any(not (node.startswith("GeometryNode") or node.startswith("FunctionNode")) or not node.replace("_", "").isalnum() for node in nodes):
+        parser.error("every --node must be a Blender GeometryNode or FunctionNode identifier")
     if not NATIVE_BLENDER.is_file():
         raise SystemExit(f"native Blender fixture generator is unavailable: {NATIVE_BLENDER.relative_to(ROOT)}")
     destination = ROOT / output