diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/ParcelableS2K.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/ParcelableS2K.java
index 78b72e90b..ee2a6a448 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/ParcelableS2K.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/ParcelableS2K.java
@@ -44,6 +44,7 @@ public abstract class ParcelableS2K implements Parcelable {
     abstract int getS2kType();
     abstract int getS2kHashAlgo();
     abstract long getS2kItCount();
+    @SuppressWarnings("mutable")
     abstract byte[] getS2kIV();
 
     @Memoized
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptData.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptData.java
index 297f150ff..59e50aefa 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptData.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptData.java
@@ -40,6 +40,7 @@ public abstract class PgpSignEncryptData implements Parcelable {
     @Nullable
     public abstract Passphrase getSymmetricPassphrase();
     @Nullable
+    @SuppressWarnings("mutable")
     public abstract long[] getEncryptionMasterKeyIds();
     public abstract int getCompressionAlgorithm();
     @Nullable
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/ChangeUnlockParcel.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/ChangeUnlockParcel.java
index c7d492141..bdf054f41 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/ChangeUnlockParcel.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/ChangeUnlockParcel.java
@@ -31,6 +31,7 @@ public abstract class ChangeUnlockParcel implements Parcelable {
     @Nullable
     public abstract Long getMasterKeyId();
     @Nullable
+    @SuppressWarnings("mutable")
     public abstract byte[] getFingerprint();
     public abstract Passphrase getNewPassphrase();
 
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/DeleteKeyringParcel.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/DeleteKeyringParcel.java
index ebc37bbc8..8b62c3c57 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/DeleteKeyringParcel.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/DeleteKeyringParcel.java
@@ -27,6 +27,7 @@ import com.google.auto.value.AutoValue;
 
 @AutoValue
 public abstract class DeleteKeyringParcel implements Parcelable {
+    @SuppressWarnings("mutable")
     public abstract long[] getMasterKeyIds();
     public abstract boolean isDeleteSecret();
 
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/PromoteKeyringParcel.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/PromoteKeyringParcel.java
index 9383a7d80..c62815c7b 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/PromoteKeyringParcel.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/PromoteKeyringParcel.java
@@ -30,8 +30,10 @@ import com.google.auto.value.AutoValue;
 public abstract class PromoteKeyringParcel implements Parcelable {
     public abstract long getMasterKeyId();
     @Nullable
+    @SuppressWarnings("mutable")
     public abstract byte[] getCardAid();
     @Nullable
+    @SuppressWarnings("mutable")
     public abstract long[] getSubKeyIds();
 
     public static PromoteKeyringParcel createPromoteKeyringParcel(long keyRingId, byte[] cardAid,
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/SaveKeyringParcel.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/SaveKeyringParcel.java
index 2f667f7a3..06909127a 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/SaveKeyringParcel.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/SaveKeyringParcel.java
@@ -55,6 +55,7 @@ public abstract class SaveKeyringParcel implements Parcelable {
     public abstract Long getMasterKeyId();
     // the key fingerprint, for safety. MUST be null for a new key.
     @Nullable
+    @SuppressWarnings("mutable")
     public abstract byte[] getFingerprint();
 
     public abstract List<String> getAddUserIds();
@@ -263,6 +264,7 @@ public abstract class SaveKeyringParcel implements Parcelable {
         // if this is non-null, the subkey will be changed to a divert-to-card
         // (security token) key for the given serial number
         @Nullable
+        @SuppressWarnings("mutable")
         public abstract byte[] getSecurityTokenSerialNo();
 
         public static SubkeyChange createRecertifyChange(long keyId, boolean recertify) {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/UploadKeyringParcel.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/UploadKeyringParcel.java
index d33e18d86..b934157a1 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/UploadKeyringParcel.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/UploadKeyringParcel.java
@@ -33,6 +33,7 @@ public abstract class UploadKeyringParcel implements Parcelable {
     @Nullable
     public abstract Long getMasterKeyId();
     @Nullable
+    @SuppressWarnings("mutable")
     public abstract byte[] getUncachedKeyringBytes();