diff --git a/render.py b/render.py
index 484adb6..ecbe766 100755
--- a/render.py
+++ b/render.py
@@ -77,9 +77,10 @@ else:
 
 if not os.path.exists('DRONES.json'):
     DRONES = defaultdict(list)
-    for letter in os.listdir('drones'):
-        for fn in sorted(os.listdir(os.path.join('drones', letter))):
-            path = os.path.join('drones', letter, fn)
+    prefix = 'drones'
+    for letter in os.listdir(prefix):
+        for fn in sorted(os.listdir(os.path.join(prefix, letter))):
+            path = os.path.join(prefix, letter, fn)
             DRONES[letter[0]].append({
                 'path': path,
                 'duration': ox.avinfo(path)['duration']