diff --git a/src/bls/bls_ies.h b/src/bls/bls_ies.h
index b7f0cf8aed..7093878fb9 100644
--- a/src/bls/bls_ies.h
+++ b/src/bls/bls_ies.h
@@ -29,7 +29,7 @@ public:
             valid = false;
         }
         READWRITE(ephemeralPubKey);
-        READWRITE(FLATDATA(iv));
+        READWRITE(iv);
         READWRITE(data);
         if (ser_action.ForRead()) {
             valid = true;
diff --git a/src/flat-database.h b/src/flat-database.h
index ffc0b61559..3c863c8c1a 100644
--- a/src/flat-database.h
+++ b/src/flat-database.h
@@ -45,7 +45,7 @@ private:
         // serialize, checksum data up to that point, then append checksum
         CDataStream ssObj(SER_DISK, CLIENT_VERSION);
         ssObj << strMagicMessage; // specific magic message for this type of object
-        ssObj << FLATDATA(Params().MessageStart()); // network specific magic number
+        ssObj << Params().MessageStart(); // network specific magic number
         ssObj << objToSave;
         uint256 hash = Hash(ssObj.begin(), ssObj.end());
         ssObj << hash;
@@ -132,7 +132,7 @@ private:
 
 
             // de-serialize file header (network specific magic number) and ..
-            ssObj >> FLATDATA(pchMsgTmp);
+            ssObj >> pchMsgTmp;
 
             // ... verify the network matches ours
             if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))