diff --git a/src/daemon/MoneroDaemon.h b/src/daemon/MoneroDaemon.h
index 4cb7930..88e305d 100644
--- a/src/daemon/MoneroDaemon.h
+++ b/src/daemon/MoneroDaemon.h
@@ -30,7 +30,6 @@ namespace monero {
 
   // forward declarations
   struct MoneroTx;
-  struct MoneroBlock;
 
   /**
    * Models a Monero block header which contains information about the block.
@@ -60,7 +59,7 @@ namespace monero {
    */
   struct MoneroBlock : public MoneroBlockHeader {
     string hex;
-    MoneroTx coinbaseTx;
+    MoneroTx* coinbaseTx;
     vector<MoneroTx> txs;
     vector<string> txIds;
   };
@@ -78,7 +77,7 @@ namespace monero {
    */
   struct MoneroOutput {
     MoneroTx* tx;
-    MoneroKeyImage keyImage;
+    MoneroKeyImage* keyImage;
     uint64_t amount;
     uint32_t index;
     vector<uint32_t> ringOutputIndices;
diff --git a/src/wallet/MoneroWallet.h b/src/wallet/MoneroWallet.h
index 1316721..1bc3f07 100644
--- a/src/wallet/MoneroWallet.h
+++ b/src/wallet/MoneroWallet.h
@@ -91,7 +91,7 @@ namespace monero {
    * Models a base transfer of funds to or from the wallet.
    */
   struct MoneroTransfer {
-    MoneroTxWallet tx;
+    MoneroTxWallet* tx;
     uint64_t amount;
     uint32_t accountIndex;
     bool isIncoming;
@@ -119,7 +119,7 @@ namespace monero {
    */
   struct MoneroTxWallet : public MoneroTx {
     vector<MoneroIncomingTransfer> incomingTransfers;
-    MoneroOutgoingTransfer outgoingTransfer;
+    MoneroOutgoingTransfer* outgoingTransfer;
     uint32_t numSuggestedConfirmations;
     string note;
   };