diff --git a/gitnexus/src/core/ingestion/class-extractors/configs/zig.ts b/gitnexus/src/core/ingestion/class-extractors/configs/zig.ts
index 1d2c5f890..82c833ac6 100644
--- a/gitnexus/src/core/ingestion/class-extractors/configs/zig.ts
+++ b/gitnexus/src/core/ingestion/class-extractors/configs/zig.ts
@@ -59,7 +59,7 @@ export const zigClassConfig: ClassExtractionConfig = {
     if (!container) return undefined;
     if (container.type === 'struct_declaration') return 'Struct';
     if (container.type === 'enum_declaration') return 'Enum';
-    if (container.type === 'union_declaration') return 'Class';
+    if (container.type === 'union_declaration') return 'Union';
     return undefined;
   },
 
diff --git a/gitnexus/src/core/ingestion/class-extractors/generic.ts b/gitnexus/src/core/ingestion/class-extractors/generic.ts
index 303eb80c0..df30f1329 100644
--- a/gitnexus/src/core/ingestion/class-extractors/generic.ts
+++ b/gitnexus/src/core/ingestion/class-extractors/generic.ts
@@ -56,6 +56,7 @@ const CLASS_LIKE_LABELS = new Set<ClassLikeNodeLabel>([
   'Interface',
   'Enum',
   'Record',
+  'Union',
 ]);
 
 const normalizeQualifiedName = (value: string): string =>
diff --git a/gitnexus/src/core/ingestion/class-types.ts b/gitnexus/src/core/ingestion/class-types.ts
index 858d4c2eb..a45999f79 100644
--- a/gitnexus/src/core/ingestion/class-types.ts
+++ b/gitnexus/src/core/ingestion/class-types.ts
@@ -3,7 +3,7 @@ import type { SyntaxNode } from './utils/ast-helpers.js';
 
 export type ClassLikeNodeLabel = Extract<
   NodeLabel,
-  'Class' | 'Struct' | 'Interface' | 'Enum' | 'Record'
+  'Class' | 'Struct' | 'Interface' | 'Enum' | 'Record' | 'Union'
 >;
 
 export interface ExtractedClassSymbol {
diff --git a/gitnexus/src/core/ingestion/tree-sitter-queries.ts b/gitnexus/src/core/ingestion/tree-sitter-queries.ts
index fa7a3c32b..6cf96dd93 100644
--- a/gitnexus/src/core/ingestion/tree-sitter-queries.ts
+++ b/gitnexus/src/core/ingestion/tree-sitter-queries.ts
@@ -1354,10 +1354,10 @@ export const ZIG_QUERIES = `
 (variable_declaration
   (identifier) @name
   (enum_declaration)) @definition.enum
-; const Tag = union(enum) { ... };  — labelled as Class (no Union NodeLabel)
+; const Tag = union(enum) { ... };
 (variable_declaration
   (identifier) @name
-  (union_declaration)) @definition.class
+  (union_declaration)) @definition.union
 
 ; ── Methods inside container bodies ──────────────────────────────────────────
 (struct_declaration
diff --git a/gitnexus/test/fixtures/lang-resolution/zig-basic/src/pioneer.zig b/gitnexus/test/fixtures/lang-resolution/zig-basic/src/pioneer.zig
index 4269bed84..2b6674c41 100644
--- a/gitnexus/test/fixtures/lang-resolution/zig-basic/src/pioneer.zig
+++ b/gitnexus/test/fixtures/lang-resolution/zig-basic/src/pioneer.zig
@@ -1,5 +1,10 @@
 pub const State = enum { idle, working };
 
+pub const Tag = union(enum) {
+    none,
+    energy: u32,
+};
+
 pub const Pioneer = struct {
     energy: u32,
 
diff --git a/gitnexus/test/integration/resolvers/zig.test.ts b/gitnexus/test/integration/resolvers/zig.test.ts
index d93451af0..0c875a2b7 100644
--- a/gitnexus/test/integration/resolvers/zig.test.ts
+++ b/gitnexus/test/integration/resolvers/zig.test.ts
@@ -23,6 +23,12 @@ describe('Zig basic resolution', () => {
     expect(getNodesByLabel(result, 'Enum')).toContain('State');
   });
 
+  it('labels `union(enum)` declarations as Union (not Class)', () => {
+    expect(getNodesByLabel(result, 'Union')).toContain('Tag');
+    // Negative-side check: Tag must NOT also appear under Class.
+    expect(getNodesByLabel(result, 'Class')).not.toContain('Tag');
+  });
+
   it('extracts top-level functions from main.zig', () => {
     const fns = getNodesByLabel(result, 'Function');
     expect(fns).toContain('main');