diff --git a/app/src/main/java/eu/faircode/email/Helper.java b/app/src/main/java/eu/faircode/email/Helper.java
index a462f1a8eb..fcf1798ffd 100644
--- a/app/src/main/java/eu/faircode/email/Helper.java
+++ b/app/src/main/java/eu/faircode/email/Helper.java
@@ -1579,7 +1579,7 @@ public class Helper {
             byte[] bytes = digest.digest(cert);
             StringBuilder sb = new StringBuilder();
             for (byte b : bytes)
-                sb.append(Integer.toString(b & 0xff, 16).toUpperCase(Locale.ROOT));
+                sb.append(String.format("%02X", b));
             return sb.toString();
         } catch (Throwable ex) {
             Log.e(ex);
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1c6b98b66d..4e2031091a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1949,6 +1949,6 @@
     </string-array>
 
     <string name="fingerprint" translatable="false">17BA15C1AF55D925F98B99CEA4375D4CDF4C174B</string>
-    <string name="fingerprint_amazon" translatable="false">20DAA43A8ADBC7BB823723C1553F4753CA7D2</string>
+    <string name="fingerprint_amazon" translatable="false">200D0AA43A8ADBC7BB8237023C1553F4753CA7D2</string>
     <string name="public_key" translatable="false">MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtFbxEbzL8u5accPGgBw/XdyiSS5BBE6ZQ9ELpKyJ/OQN+kdYniCAOw3lsQ/GuJScy4Y2HobqbBgLL8GLHG+Yu2EHC9dLjA3v2Mc25vvnfn86BsrpQvz1poN2n+roTBdq09FWbtebJ8m0hDBVmtfRi7RhTKIL4No3kodLhksdnucKjcFheubebWKgpmvbmw7NwuELhaZmyhw8WTtnQ4rZPMhjY1JJZgzwNExXgD7zzg4pJPkuQlfkuRkkvBpHpi3C7VDnYjrBlLHngI4wv3wxQBVwJqlvAT9PmX8dOVnTsWWdJdLQBZVWphuqVY54kjBIovN+o8w03WjsV9QiOQq+XwIDAQAB</string>
 </resources>