diff --git a/graphql.go b/graphql.go
index eff0b9a3..18c9f913 100644
--- a/graphql.go
+++ b/graphql.go
@@ -72,13 +72,13 @@ type Schema struct {
 	useStringDescriptions bool
 	disableIntrospection  bool
 
-	extendRes interface{}
+	extendRes map[string]interface{}
 }
 
 // SchemaOpt is an option to pass to ParseSchema or MustParseSchema.
 type SchemaOpt func(*Schema)
 
-func UseExtendResolver(ext interface{}) SchemaOpt {
+func UseExtendResolver(ext map[string]interface{}) SchemaOpt {
 	return func(s *Schema) {
 		s.extendRes = ext
 	}
diff --git a/graphql_test.go b/graphql_test.go
index cb0cab4a..37a249fe 100644
--- a/graphql_test.go
+++ b/graphql_test.go
@@ -163,6 +163,48 @@ func (r *discussPlanResolver) DismissVader(ctx context.Context) (string, error)
 	return "", errors.New("I find your lack of faith disturbing")
 }
 
+type ByeWorldResolver1 struct {
+	helloWorldResolver1
+}
+
+func (b *ByeWorldResolver1) Bye() string {
+	return "Bye world!"
+}
+
+func TestExtendResolver(t *testing.T) {
+	t.Parallel()
+
+	extResolvers := make(map[string]interface{})
+	extResolvers["Query"] = &ByeWorldResolver1{}
+
+	gqltesting.RunTests(t, []*gqltesting.Test{
+		{
+
+			Schema: graphql.MustParseSchema(`
+				schema {
+					query: Query
+				}
+
+				type Query {
+					hello: String!
+					bye: String!
+				}`, &helloWorldResolver1{}, graphql.UseExtendResolver(extResolvers)),
+			Query: `
+				{
+					hello
+					bye
+				}
+			`,
+			ExpectedResult: `
+				{
+					"hello": "Hello world!",
+					"bye": "Bye world!"
+				}
+			`,
+		},
+	})
+}
+
 func TestHelloWorld(t *testing.T) {
 	t.Parallel()
 
@@ -2742,7 +2784,9 @@ func (r *inputResolver) Nullable(args struct{ Value *int32 }) *int32 {
 	return args.Value
 }
 
-func (r *inputResolver) List(args struct{ Value []*struct{ V int32 } }) []int32 {
+func (r *inputResolver) List(args struct {
+	Value []*struct{ V int32 }
+}) []int32 {
 	l := make([]int32, len(args.Value))
 	for i, entry := range args.Value {
 		l[i] = entry.V
@@ -2750,7 +2794,9 @@ func (r *inputResolver) List(args struct{ Value []*struct{ V int32 } }) []int32
 	return l
 }
 
-func (r *inputResolver) NullableList(args struct{ Value *[]*struct{ V int32 } }) *[]*int32 {
+func (r *inputResolver) NullableList(args struct {
+	Value *[]*struct{ V int32 }
+}) *[]*int32 {
 	if args.Value == nil {
 		return nil
 	}
@@ -2926,7 +2972,7 @@ func TestInput(t *testing.T) {
 	})
 }
 
-type inputArgumentsHello struct {}
+type inputArgumentsHello struct{}
 
 type inputArgumentsScalarMismatch1 struct{}
 
@@ -2946,7 +2992,7 @@ type helloInputMismatch struct {
 	World string
 }
 
-func (r *inputArgumentsHello) Hello(args struct { Input *helloInput }) string {
+func (r *inputArgumentsHello) Hello(args struct{ Input *helloInput }) string {
 	return "Hello " + args.Input.Name + "!"
 }
 
@@ -2954,7 +3000,7 @@ func (r *inputArgumentsScalarMismatch1) Hello(name string) string {
 	return "Hello " + name + "!"
 }
 
-func (r *inputArgumentsScalarMismatch2) Hello(args struct { World string }) string {
+func (r *inputArgumentsScalarMismatch2) Hello(args struct{ World string }) string {
 	return "Hello " + args.World + "!"
 }
 
@@ -2962,11 +3008,11 @@ func (r *inputArgumentsObjectMismatch1) Hello(in helloInput) string {
 	return "Hello " + in.Name + "!"
 }
 
-func (r *inputArgumentsObjectMismatch2) Hello(args struct { Input *helloInputMismatch }) string {
+func (r *inputArgumentsObjectMismatch2) Hello(args struct{ Input *helloInputMismatch }) string {
 	return "Hello " + args.Input.World + "!"
 }
 
-func (r *inputArgumentsObjectMismatch3) Hello(args struct { Input *struct { Thing string } }) string {
+func (r *inputArgumentsObjectMismatch3) Hello(args struct{ Input *struct{ Thing string } }) string {
 	return "Hello " + args.Input.Thing + "!"
 }
 
diff --git a/internal/exec/exec.go b/internal/exec/exec.go
index 1504b5ce..bbf1ed49 100644
--- a/internal/exec/exec.go
+++ b/internal/exec/exec.go
@@ -204,8 +204,8 @@ func execFieldSelection(ctx context.Context, r *Request, s *resolvable.Schema, f
 
 			var callOut []reflect.Value
 
-			if f.field.TypeName == "statTeam" {
-				res = reflect.NewAt(s.ExtResolver.Elem().Type(), unsafe.Pointer(res.Elem().UnsafeAddr()))
+			if v, ok := s.ExtResolver[f.field.TypeName]; ok {
+				res = reflect.NewAt(v.Elem().Type(), unsafe.Pointer(res.Elem().UnsafeAddr()))
 			}
 
 			callOut = res.Method(f.field.MethodIndex).Call(in)
diff --git a/internal/exec/resolvable/resolvable.go b/internal/exec/resolvable/resolvable.go
index 6278d2c7..2e6f6e45 100644
--- a/internal/exec/resolvable/resolvable.go
+++ b/internal/exec/resolvable/resolvable.go
@@ -18,7 +18,7 @@ type Schema struct {
 	Mutation     Resolvable
 	Subscription Resolvable
 	Resolver     reflect.Value
-	ExtResolver  reflect.Value
+	ExtResolver  map[string]reflect.Value
 }
 
 type Resolvable interface {
@@ -62,7 +62,7 @@ func (*Object) isResolvable() {}
 func (*List) isResolvable()   {}
 func (*Scalar) isResolvable() {}
 
-func ApplyResolver(s *schema.Schema, resolver interface{}, ext interface{}) (*Schema, error) {
+func ApplyResolver(s *schema.Schema, resolver interface{}, ext map[string]interface{}) (*Schema, error) {
 	if resolver == nil {
 		return &Schema{Meta: newMeta(s), Schema: *s}, nil
 	}
@@ -72,19 +72,19 @@ func ApplyResolver(s *schema.Schema, resolver interface{}, ext interface{}) (*Sc
 	var query, mutation, subscription Resolvable
 
 	if t, ok := s.EntryPoints["query"]; ok {
-		if err := b.assignExec(&query, t, reflect.TypeOf(resolver), reflect.TypeOf(ext)); err != nil {
+		if err := b.assignExec(&query, t, reflect.TypeOf(resolver), ext); err != nil {
 			return nil, err
 		}
 	}
 
 	if t, ok := s.EntryPoints["mutation"]; ok {
-		if err := b.assignExec(&mutation, t, reflect.TypeOf(resolver), reflect.TypeOf(ext)); err != nil {
+		if err := b.assignExec(&mutation, t, reflect.TypeOf(resolver), ext); err != nil {
 			return nil, err
 		}
 	}
 
 	if t, ok := s.EntryPoints["subscription"]; ok {
-		if err := b.assignExec(&subscription, t, reflect.TypeOf(resolver), reflect.TypeOf(ext)); err != nil {
+		if err := b.assignExec(&subscription, t, reflect.TypeOf(resolver), ext); err != nil {
 			return nil, err
 		}
 	}
@@ -93,11 +93,16 @@ func ApplyResolver(s *schema.Schema, resolver interface{}, ext interface{}) (*Sc
 		return nil, err
 	}
 
+	extResolvers := make(map[string]reflect.Value)
+	for i := range ext {
+		extResolvers[i] = reflect.ValueOf(ext[i])
+	}
+
 	return &Schema{
 		Meta:         newMeta(s),
 		Schema:       *s,
 		Resolver:     reflect.ValueOf(resolver),
-		ExtResolver:  reflect.ValueOf(ext),
+		ExtResolver:  extResolvers,
 		Query:        query,
 		Mutation:     mutation,
 		Subscription: subscription,
@@ -138,7 +143,7 @@ func (b *execBuilder) finish() error {
 	return b.packerBuilder.Finish()
 }
 
-func (b *execBuilder) assignExec(target *Resolvable, t common.Type, resolverType reflect.Type, ext reflect.Type) error {
+func (b *execBuilder) assignExec(target *Resolvable, t common.Type, resolverType reflect.Type, ext map[string]interface{}) error {
 	k := typePair{t, resolverType}
 	ref, ok := b.resMap[k]
 	if !ok {
@@ -155,14 +160,16 @@ func (b *execBuilder) assignExec(target *Resolvable, t common.Type, resolverType
 	return nil
 }
 
-func (b *execBuilder) makeExec(t common.Type, resolverType reflect.Type, ext reflect.Type) (Resolvable, error) {
+func (b *execBuilder) makeExec(t common.Type, resolverType reflect.Type, ext map[string]interface{}) (Resolvable, error) {
 	var nonNull bool
 	t, nonNull = unwrapNonNull(t)
 
 	switch t := t.(type) {
 	case *schema.Object:
-		if t.Name == "statTeam" && ext != nil {
-			resolverType = ext
+		if ext != nil {
+			if v, ok := ext[t.Name]; ok {
+				resolverType = reflect.TypeOf(v)
+			}
 		}
 
 		return b.makeObjectExec(t.Name, t.Fields, nil, nonNull, resolverType, ext)
@@ -224,7 +231,7 @@ func makeScalarExec(t *schema.Scalar, resolverType reflect.Type) (Resolvable, er
 }
 
 func (b *execBuilder) makeObjectExec(typeName string, fields schema.FieldList, possibleTypes []*schema.Object,
-	nonNull bool, resolverType reflect.Type, ext reflect.Type) (*Object, error) {
+	nonNull bool, resolverType reflect.Type, ext map[string]interface{}) (*Object, error) {
 	if !nonNull {
 		if resolverType.Kind() != reflect.Ptr && resolverType.Kind() != reflect.Interface {
 			return nil, fmt.Errorf("%s is not a pointer or interface", resolverType)
@@ -301,7 +308,7 @@ var contextType = reflect.TypeOf((*context.Context)(nil)).Elem()
 var errorType = reflect.TypeOf((*error)(nil)).Elem()
 
 func (b *execBuilder) makeFieldExec(typeName string, f *schema.Field, m reflect.Method, sf reflect.StructField,
-	methodIndex int, fieldIndex []int, methodHasReceiver bool, ext reflect.Type) (*Field, error) {
+	methodIndex int, fieldIndex []int, methodHasReceiver bool, ext map[string]interface{}) (*Field, error) {
 
 	var argsPacker *packer.StructPacker
 	var hasError bool