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-rw-r--r--src/analyze.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/analyze.cpp b/src/analyze.cpp
index 66d2963425..74dfd003d9 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -2558,6 +2558,8 @@ static void resolve_union_zero_bits(CodeGen *g, TypeTableEntry *union_type) {
HashMap<BigInt, AstNode *, bigint_hash, bigint_eql> occupied_tag_values = {};
AstNode *enum_type_node = decl_node->data.container_decl.init_arg_expr;
+ union_type->data.unionation.have_explicit_tag_type = decl_node->data.container_decl.auto_enum ||
+ enum_type_node != nullptr;
bool auto_layout = (union_type->data.unionation.layout == ContainerLayoutAuto);
bool want_safety = (field_count >= 2) && (auto_layout || enum_type_node != nullptr);
TypeTableEntry *tag_type;