diff --git a/Makefile b/Makefile
index a4492ea..9fe962f 100644
--- a/Makefile
+++ b/Makefile
@@ -35,4 +35,4 @@ build:
 
 # run
 run:
-	rye run python src/stacosys/run.py $(RUN_ARGS)
\ No newline at end of file
+	PYTHONPATH=src/ rye run python src/stacosys/run.py $(RUN_ARGS)
\ No newline at end of file