diff --git a/lib/nexrad/archive.py b/lib/nexrad/archive.py
index 53883c6..7491b41 100644
--- a/lib/nexrad/archive.py
+++ b/lib/nexrad/archive.py
@@ -11,10 +11,10 @@ class Archive():
         self.bucket = bucket
 
     def is_archived(self, key: str):
-        return os.path.exists(self.path + '/' + key)
+        return os.path.exists(os.path.join(self.path, key))
 
     def archive(self, key: str):
-        path   = self.path + '/' + key
+        path   = os.path.join(self.path, key)
         parent = os.path.dirname(path)
 
         os.makedirs(parent, exist_ok=True)