diff --git a/scripts/update_payload/common.py b/scripts/update_payload/common.py
index a869730..584eb35 100644
--- a/scripts/update_payload/common.py
+++ b/scripts/update_payload/common.py
@@ -132,7 +132,7 @@
 
 def FormatSha256(digest):
   """Returns a canonical string representation of a SHA256 digest."""
-  return digest.encode('base64')
+  return digest.encode('base64').strip()
 
 
 #