diff --git a/core/src/main/java/com/google/bitcoin/params/RegTestParams.java b/core/src/main/java/com/google/bitcoin/params/RegTestParams.java
index b6e90c06..7c0425e2 100644
--- a/core/src/main/java/com/google/bitcoin/params/RegTestParams.java
+++ b/core/src/main/java/com/google/bitcoin/params/RegTestParams.java
@@ -35,6 +35,7 @@ public class RegTestParams extends TestNet2Params {
         subsidyDecreaseBlockCount = 10000;
         port = 18444;
         acceptableAddressCodes = new int[] { 0 };
+        addressHeader = 0;
     }
 
     @Override