diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
index 26ad69eb7..ccd83c334 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
@@ -933,7 +933,7 @@ public class PgpKeyOperation {
         }
 
         PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
-                pKey.getAlgorithm(), PGPUtil.SHA1)
+                masterPrivateKey.getPublicKeyPacket().getAlgorithm(), PGPUtil.SHA1)
                 .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
         PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
         sGen.init(PGPSignature.SUBKEY_BINDING, masterPrivateKey);