diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index 9ed8012bf..5d93de66b 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -307,7 +307,7 @@ public:
     const uint32_t nLockTime;
     const std::vector<JSDescription> vjoinsplit;
     const uint256 joinSplitPubKey;
-    const joinsplit_sig_t joinSplitSig;
+    const joinsplit_sig_t joinSplitSig = {0};
 
     /** Construct a CTransaction that qualifies as IsNull() */
     CTransaction();