diff --git a/src/Serializer.h b/src/Serializer.h
index c8f9284b53..dde5c564e6 100644
--- a/src/Serializer.h
+++ b/src/Serializer.h
@@ -122,7 +122,7 @@ protected:
 
 	// This will be increased whenever there is an incompatible change
 	// in the data format.
-	static const uint32 DATA_FORMAT_VERSION = 18;
+	static const uint32 DATA_FORMAT_VERSION = 19;
 
 	ChunkedIO* io;