diff --git a/src/SerializedTransaction.h b/src/SerializedTransaction.h
index d24a3fb762..a983a091e6 100644
--- a/src/SerializedTransaction.h
+++ b/src/SerializedTransaction.h
@@ -10,13 +10,14 @@
 class SerializedTransaction : public STUObject
 {
 protected:
+	TransactionType type;
 	STUVariableLength mSignature;
 	STUObject mMiddleTxn, mInnerTxn;
 	TransactionFormat* mFormat;
 
 public:
 	SerializedTransaction(SerializerIterator&, int length);
-	SerializedTransaction(int type);
+	SerializedTransaction(TransactionType type);
 
 	// STUObject functions
 	int getLength() const;
diff --git a/src/SerializedTypes.cpp b/src/SerializedTypes.cpp
index acdb2d1a28..9366c6415a 100644
--- a/src/SerializedTypes.cpp
+++ b/src/SerializedTypes.cpp
@@ -3,6 +3,7 @@
 
 #include "SerializedTypes.h"
 #include "SerializedObject.h"
+#include "TransactionFormats.h"
 
 std::string SerializedType::getFullText() const
 {
diff --git a/src/TransactionFormats.h b/src/TransactionFormats.h
index a0b06283da..e4a0d5b0c0 100644
--- a/src/TransactionFormats.h
+++ b/src/TransactionFormats.h
@@ -14,4 +14,11 @@ struct TransactionFormat
 
 extern TransactionFormat InnerTxnFormats[];
 
+enum TransactionType
+{
+	ttMAKE_PAYMENT=0,
+	ttNTX_INVOICE=1,
+	ttEXCHANGE_OFFER=2
+};
+
 #endif