diff --git a/src/Type.cc b/src/Type.cc
index 7556da698b..ce39ddf838 100644
--- a/src/Type.cc
+++ b/src/Type.cc
@@ -947,6 +947,20 @@ TypeDecl::~TypeDecl()
 	delete[] id;
 	}
 
+TypeDecl& TypeDecl::operator=(const TypeDecl& other)
+	{
+	if ( this == &other )
+		return *this;
+
+	type = other.type;
+	attrs = other.attrs;
+
+	delete[] id;
+	id = util::copy_string(other.id);
+
+	return *this;
+	}
+
 void TypeDecl::DescribeReST(ODesc* d, bool roles_only) const
 	{
 	d->Add(id);
diff --git a/src/Type.h b/src/Type.h
index 0e34e83c48..52b0920675 100644
--- a/src/Type.h
+++ b/src/Type.h
@@ -583,6 +583,8 @@ public:
 	TypeDecl(const TypeDecl& other);
 	~TypeDecl();
 
+	TypeDecl& operator=(const TypeDecl& other);
+
 	const detail::AttrPtr& GetAttr(detail::AttrTag a) const
 		{
 		return attrs ? attrs->Find(a) : detail::Attr::nil;
diff --git a/src/input/readers/ascii/Ascii.cc b/src/input/readers/ascii/Ascii.cc
index a021ad28f8..635d93f70f 100644
--- a/src/input/readers/ascii/Ascii.cc
+++ b/src/input/readers/ascii/Ascii.cc
@@ -47,6 +47,21 @@ FieldMapping FieldMapping::subType()
 	return FieldMapping(name, subtype, position);
 	}
 
+FieldMapping& FieldMapping::operator=(const FieldMapping& arg)
+	{
+	if ( this == &arg )
+		return *this;
+
+	name = arg.name;
+	type = arg.type;
+	subtype = arg.subtype;
+	present = arg.present;
+	position = arg.position;
+	secondary_position = arg.secondary_position;
+
+	return *this;
+	}
+
 Ascii::Ascii(ReaderFrontend* frontend) : ReaderBackend(frontend)
 	{
 	mtime = 0;
diff --git a/src/input/readers/ascii/Ascii.h b/src/input/readers/ascii/Ascii.h
index 5f3370971d..d572259e4a 100644
--- a/src/input/readers/ascii/Ascii.h
+++ b/src/input/readers/ascii/Ascii.h
@@ -32,6 +32,8 @@ struct FieldMapping
 	FieldMapping(const FieldMapping& arg);
 	FieldMapping() = default;
 
+	FieldMapping& operator=(const FieldMapping& arg);
+
 	FieldMapping subType();
 	};