diff --git a/core/src/main/java/com/google/bitcoin/store/UnreadableWalletException.java b/core/src/main/java/com/google/bitcoin/store/UnreadableWalletException.java
index 0c9d31bcf..6c135bd8b 100644
--- a/core/src/main/java/com/google/bitcoin/store/UnreadableWalletException.java
+++ b/core/src/main/java/com/google/bitcoin/store/UnreadableWalletException.java
@@ -22,4 +22,10 @@ public class UnreadableWalletException extends Exception {
     public static class FutureVersion extends UnreadableWalletException {
         public FutureVersion() { super("Unknown wallet version from the future."); }
     }
+
+    public static class WrongNetwork extends UnreadableWalletException {
+        public WrongNetwork() {
+            super("Mismatched network ID");
+        }
+    }
 }
diff --git a/core/src/main/java/com/google/bitcoin/store/WalletProtobufSerializer.java b/core/src/main/java/com/google/bitcoin/store/WalletProtobufSerializer.java
index 4599aeddf..1fede095f 100644
--- a/core/src/main/java/com/google/bitcoin/store/WalletProtobufSerializer.java
+++ b/core/src/main/java/com/google/bitcoin/store/WalletProtobufSerializer.java
@@ -383,6 +383,8 @@ public class WalletProtobufSerializer {
                              Protos.Wallet walletProto) throws UnreadableWalletException {
         if (walletProto.getVersion() > 1)
             throw new UnreadableWalletException.FutureVersion();
+        if (!walletProto.getNetworkIdentifier().equals(params.getId()))
+            throw new UnreadableWalletException.WrongNetwork();
 
         // Read the scrypt parameters that specify how encryption and decryption is performed.
         KeyChainGroup chain;