diff --git a/src/com/fsck/k9/net/ssl/KeyChainKeyManager.java b/src/com/fsck/k9/net/ssl/KeyChainKeyManager.java
index b1e1f88f6..e15edca1f 100644
--- a/src/com/fsck/k9/net/ssl/KeyChainKeyManager.java
+++ b/src/com/fsck/k9/net/ssl/KeyChainKeyManager.java
@@ -40,9 +40,9 @@ public class KeyChainKeyManager extends X509ExtendedKeyManager {
     }
 
 
-    private String mAlias;
-    private X509Certificate[] mChain;
-    private PrivateKey mPrivateKey;
+    private final String mAlias;
+    private final X509Certificate[] mChain;
+    private final PrivateKey mPrivateKey;
 
 
     /**