diff --git a/src/txdb.h b/src/txdb.h
index 1ce93969d..86e1c5d83 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -16,7 +16,7 @@
 
 class CBlockFileInfo;
 class CBlockIndex;
-class CDiskTxPos;
+struct CDiskTxPos;
 class uint256;
 
 //! -dbcache default (MiB)
diff --git a/src/validationinterface.h b/src/validationinterface.h
index b21b6e578..bee67d892 100644
--- a/src/validationinterface.h
+++ b/src/validationinterface.h
@@ -9,7 +9,7 @@
 #include <boost/signals2/signal.hpp>
 
 class CBlock;
-class CBlockLocator;
+struct CBlockLocator;
 class CTransaction;
 class CValidationInterface;
 class CValidationState;