diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index b132e4ff8..743e381f7 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -4189,7 +4189,7 @@ MemberList::MemberMap MagicType::nativeMembers(ASTNode const*) const
 		});
 	case Kind::MetaType:
 	{
-		solAssert(m_typeArgument != nullptr, "");
+		solAssert(!m_typeArgument, "");
 		if (m_typeArgument->category() == Type::Category::Contract)
 		{
 			ContractDefinition const& contract = dynamic_cast<ContractType const&>(*m_typeArgument).contractDefinition();