diff --git a/site_scons/site_tools/rednose_filter.py b/site_scons/site_tools/rednose_filter.py
index af5cd44..1a26a3b 100644
--- a/site_scons/site_tools/rednose_filter.py
+++ b/site_scons/site_tools/rednose_filter.py
@@ -9,7 +9,7 @@ def compile_single_filter(env, target, filter_gen_script, output_dir, extra_gen_
   generator_file = File(filter_gen_script)
 
   env.Command(generated_src_files + extra_generated_files,
-              [generator_file] + script_deps, f"{File(generator_file).abspath} {target} {Dir(output_dir).relpath}")
+              [generator_file] + script_deps, f"{File(generator_file).relpath} {target} {Dir(output_dir).relpath}")
 
   generated_cc_file = File(generated_src_files[:1])