diff --git a/src/serialize.h b/src/serialize.h
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -187,6 +187,9 @@
 template <typename Stream> inline void Serialize(Stream &s, uint64_t a) {
     ser_writedata64(s, a);
 }
+template <typename Stream> inline void Serialize(Stream &s, long a) {
+    ser_writedata64(s, a);
+}
 template <typename Stream> inline void Serialize(Stream &s, float a) {
     ser_writedata32(s, ser_float_to_uint32(a));
 }
@@ -221,6 +224,9 @@
 template <typename Stream> inline void Unserialize(Stream &s, uint64_t &a) {
     a = ser_readdata64(s);
 }
+template <typename Stream> inline void Unserialize(Stream &s, long &a) {
+    a = ser_readdata64(s);
+}
 template <typename Stream> inline void Unserialize(Stream &s, float &a) {
     a = ser_uint32_to_float(ser_readdata32(s));
 }