diff --git a/core/src/main/java/org/bitcoinj/core/Transaction.java b/core/src/main/java/org/bitcoinj/core/Transaction.java
index a9e2f9bb923..4ed61115273 100644
--- a/core/src/main/java/org/bitcoinj/core/Transaction.java
+++ b/core/src/main/java/org/bitcoinj/core/Transaction.java
@@ -527,6 +527,7 @@ public byte byteValue() {
     protected void unCache() {
         super.unCache();
         hash = null;
+        confidence = null;
     }
 
     protected static int calcLength(byte[] buf, int offset) {