diff --git a/tools/src/main/java/org/bitcoinj/tools/BlockImporter.java b/tools/src/main/java/org/bitcoinj/tools/BlockImporter.java
index f4fce52c..66e35d7b 100644
--- a/tools/src/main/java/org/bitcoinj/tools/BlockImporter.java
+++ b/tools/src/main/java/org/bitcoinj/tools/BlockImporter.java
@@ -39,6 +39,7 @@ public class BlockImporter {
             params = TestNet3Params.get();
         else
             params = MainNetParams.get();
+        new Context(params);
         
         BlockStore store;
         if (args[1].equals("H2")) {