diff --git a/src/tag.spec-d.ts b/src/tag.spec-d.ts
index 68db9e1..312f569 100644
--- a/src/tag.spec-d.ts
+++ b/src/tag.spec-d.ts
@@ -16,23 +16,23 @@ test('tag function returns a tag factory when a callback is provided', () => {
 
   const value = factory('foo')
 
-  expectTypeOf(value).toExtend<QueryTag<Unset>>()
+  expectTypeOf(value).toEqualTypeOf<QueryTag<Unset>>()
 })
 
 test('tag function returns a typed tag when data generic is provided', () => {
   const value = tag<string>()
 
-  expectTypeOf(value).toExtend<QueryTag<string>>()
+  expectTypeOf(value).toEqualTypeOf<QueryTag<string>>()
 })
 
 test('tag factory returns a typed tag when data generic is provided', () => {
   const factory = tag<string, string>((value: string) => value)
 
-  expectTypeOf(factory).toExtend<QueryTagFactory<string, string>>()
+  expectTypeOf(factory).toEqualTypeOf<QueryTagFactory<string, string>>()
 
   const value = factory('foo')
 
-  expectTypeOf(value).toExtend<QueryTag<string>>()
+  expectTypeOf(value).toEqualTypeOf<QueryTag<string>>()
 })
 
 test('query from query function with tags callback is called with the query data', () => {
@@ -41,7 +41,7 @@ test('query from query function with tags callback is called with the query data
 
   query(action, [], {
     tags: (data) => {
-      expectTypeOf(data).toExtend<string>()
+      expectTypeOf(data).toEqualTypeOf<string>()
 
       return []
     },
@@ -54,7 +54,7 @@ test('query from query composition with tags callback is called with the query d
 
   useQuery(action, () => [], {
     tags: (data) => {
-      expectTypeOf(data).toExtend<string>()
+      expectTypeOf(data).toEqualTypeOf<string>()
 
       return []
     },