diff --git a/scripts/poster.py b/scripts/poster.py
index 02b5713..33d3c3c 100755
--- a/scripts/poster.py
+++ b/scripts/poster.py
@@ -37,8 +37,8 @@ def get_frame(id, height, position):
 def get_hue(collection, title):
     return ox.getHSL(
         [int(''.join(x), 16) for x in zip(
-            hashlib.sha1(collection).hexdigest()[:3],
-            hashlib.sha1(title).hexdigest()[:3]
+            hashlib.sha1(collection.encode('utf-8')).hexdigest()[:3],
+            hashlib.sha1(title.encode('utf-8')).hexdigest()[:3]
         )]
     )[0]