diff --git a/src/OpaqueVal.cc b/src/OpaqueVal.cc
index dcf3e84430..211426a434 100644
--- a/src/OpaqueVal.cc
+++ b/src/OpaqueVal.cc
@@ -554,7 +554,7 @@ bool BloomFilterVal::Typify(BroType* arg_type)
 	type->Ref();
 
 	TypeList* tl = new TypeList(type);
-	tl->Append(type);
+	tl->Append(type->Ref());
 	hash = new CompositeHash(tl);
 	Unref(tl);
 
@@ -760,7 +760,7 @@ bool CardinalityVal::Typify(BroType* arg_type)
 	type->Ref();
 
 	TypeList* tl = new TypeList(type);
-	tl->Append(type);
+	tl->Append(type->Ref());
 	hash = new CompositeHash(tl);
 	Unref(tl);
 
diff --git a/src/Serializer.h b/src/Serializer.h
index 719d4dc527..f2cea1000e 100644
--- a/src/Serializer.h
+++ b/src/Serializer.h
@@ -126,7 +126,7 @@ protected:
 
 	// This will be increased whenever there is an incompatible change
 	// in the data format.
-	static const uint32 DATA_FORMAT_VERSION = 23;
+	static const uint32 DATA_FORMAT_VERSION = 24;
 
 	ChunkedIO* io;