diff --git a/core/src/main/java/org/bitcoinj/wallet/CoinJoinExtension.java b/core/src/main/java/org/bitcoinj/wallet/CoinJoinExtension.java
index 49d596c72..4e941935f 100644
--- a/core/src/main/java/org/bitcoinj/wallet/CoinJoinExtension.java
+++ b/core/src/main/java/org/bitcoinj/wallet/CoinJoinExtension.java
@@ -71,7 +71,7 @@
 
 public class CoinJoinExtension extends AbstractKeyChainGroupExtension {
     private static final Logger log = LoggerFactory.getLogger(CoinJoinExtension.class);
-    private static final int COINJOIN_LOOKADHEAD = 400;
+    private static final int COINJOIN_LOOKADHEAD = 500;
     private static final int COINJOIN_LOOKADHEAD_THRESHOLD = COINJOIN_LOOKADHEAD - 1;
 
     protected AnyKeyChainGroup coinJoinKeyChainGroup;