diff --git a/src/stage1/ir.cpp b/src/stage1/ir.cpp
index 7906df3b0..e0e08ddbc 100644
--- a/src/stage1/ir.cpp
+++ b/src/stage1/ir.cpp
@@ -24153,7 +24153,8 @@ static IrInstGen *ir_analyze_instruction_switch_target(IrAnalyze *ira,
         case ZigTypeIdUnion: {
             AstNode *decl_node = target_type->data.unionation.decl_node;
             if (!decl_node->data.container_decl.auto_enum &&
-                decl_node->data.container_decl.init_arg_expr == nullptr)
+                decl_node->data.container_decl.init_arg_expr == nullptr
+                && target_type->data.unionation.tag_type == nullptr)
             {
                 ErrorMsg *msg = ir_add_error(ira, &target_value_ptr->base,
                     buf_sprintf("switch on union which has no attached enum"));