diff --git a/lib/arch.py b/lib/arch.py
index c3702ce..c53c189 100644
--- a/lib/arch.py
+++ b/lib/arch.py
@@ -27,4 +27,5 @@ def set_target(arch: str):
     global _target
     _target = arch
     for key in all[_target].keys():
-        os.environ[key] = all[_target][key]
+        if not os.environ.get(key):
+            os.environ[key] = all[_target][key]