diff --git a/rule/confusing-naming.go b/rule/confusing-naming.go
index 34cdb90..8b1c3ea 100644
--- a/rule/confusing-naming.go
+++ b/rule/confusing-naming.go
@@ -27,10 +27,10 @@ type packages struct {
 
 func (ps *packages) methodNames(lp *lint.Package) pkgMethods {
 	ps.mu.Lock()
+	defer ps.mu.Unlock()
 
 	for _, pkg := range ps.pkgs {
 		if pkg.pkg == lp {
-			ps.mu.Unlock()
 			return pkg
 		}
 	}
@@ -38,7 +38,6 @@ func (ps *packages) methodNames(lp *lint.Package) pkgMethods {
 	pkgm := pkgMethods{pkg: lp, methods: make(map[string]map[string]*referenceMethod), mu: &sync.Mutex{}}
 	ps.pkgs = append(ps.pkgs, pkgm)
 
-	ps.mu.Unlock()
 	return pkgm
 }
 
@@ -72,6 +71,7 @@ func (*ConfusingNamingRule) Name() string {
 
 // checkMethodName checks if a given method/function name is similar (just case differences) to other method/function of the same struct/file.
 func checkMethodName(holder string, id *ast.Ident, w *lintConfusingNames) {
+
 	if id.Name == "init" && holder == defaultStructName {
 		// ignore init functions
 		return
@@ -137,8 +137,11 @@ func getStructName(r *ast.FieldList) string {
 
 	t := r.List[0].Type
 
-	if p, _ := t.(*ast.StarExpr); p != nil { // if a pointer receiver => dereference pointer receiver types
-		t = p.X
+	switch v := t.(type) {
+	case *ast.StarExpr:
+		t = v.X
+	case *ast.IndexExpr:
+		t = v.X
 	}
 
 	if p, _ := t.(*ast.Ident); p != nil {
diff --git a/testdata/confusing-naming1.go b/testdata/confusing-naming1.go
index ba12b07..5b06bac 100644
--- a/testdata/confusing-naming1.go
+++ b/testdata/confusing-naming1.go
@@ -1,5 +1,4 @@
 // Test of confusing-naming rule.
-
 // Package pkg ...
 package pkg
 
@@ -60,3 +59,14 @@ type tBar struct {
 	qwe bool
 	zxc float32
 }
+
+// issue #864
+type x[T any] struct{}
+
+func (x[T]) method() {
+}
+
+type y[T any] struct{}
+
+func (y[T]) method() {
+}