diff --git a/package.go b/package.go
index f861677..2e15c26 100644
--- a/package.go
+++ b/package.go
@@ -219,17 +219,7 @@ func (c *PathPackageClassifier) Classify(pkg *Package) PackageClass {
 // Otherwise, false is retuned.
 func IsStandardLibrary(pkg string) bool {
 	_, ok := stdPkgs[pkg]
-	if ok {
-		return true
-	}
-
-	// Detect regexp.(*onePassInst).regexp/syntax type packages
-	tmp := strings.Split(pkg, ".")[0]
-	if len(tmp) < len(pkg) && IsStandardLibrary(tmp) {
-		return true
-	}
-
-	return false
+	return ok
 }
 
 func isGeneratedPackage(pkg *Package) bool {
diff --git a/package_test.go b/package_test.go
index e9f49f8..fd152c6 100644
--- a/package_test.go
+++ b/package_test.go
@@ -59,21 +59,13 @@ func TestClassifyPackage(t *testing.T) {
 		{"crypto/sha512", "C:/Go/src/crypto/sha512", ClassSTD},
 		{"crypto/subtle", "C:/Go/src/crypto/subtle", ClassSTD},
 		{"crypto/tls", "C:/Go/src/crypto/tls", ClassSTD},
-		{"crypto/tls.(*Config).(crypto/tls", "C:/Go/src/crypto/tls", ClassSTD},
 		{"crypto/x509", "C:/Go/src/crypto/x509", ClassSTD},
 		{"crypto/x509/pkix", "C:/Go/src/crypto/x509/pkix", ClassSTD},
 		{"encoding/asn1", "C:/Go/src/encoding/asn1", ClassSTD},
 		{"encoding/base64", "C:/Go/src/encoding/base64", ClassSTD},
 		{"encoding/binary", "C:/Go/src/encoding/binary", ClassSTD},
 		{"encoding/hex", "C:/Go/src/encoding/hex", ClassSTD},
-		{"encoding/json.(*arrayEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
 		{"encoding/json", "C:/Go/src/encoding/json", ClassSTD},
-		{"encoding/json.(*condAddrEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
-		{"encoding/json.(floatEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
-		{"encoding/json.(*mapEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
-		{"encoding/json.(*ptrEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
-		{"encoding/json.(*sliceEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
-		{"encoding/json.(*structEncoder).(encoding/json", "C:/Go/src/encoding/json", ClassSTD},
 		{"encoding/pem", "C:/Go/src/encoding/pem", ClassSTD},
 		{"errors", "C:/Go/src/errors", ClassSTD},
 		{"fmt", "C:/Go/src/fmt", ClassSTD},
@@ -98,11 +90,6 @@ func TestClassifyPackage(t *testing.T) {
 		{"golang.org/x/crypto/ssh", "C:/Users/h/CloudStation/Projects/0/ly/lady/vendor/src/golang.org/x/crypto/ssh", ClassVendor},
 		{"golang.org/x/net/publicsuffix", "C:/Users/h/CloudStation/Projects/0/ly/lady/vendor/src/golang.org/x/net/publicsuffix", ClassVendor},
 		{"gopkg.in/vmihailenco/msgpack%2ev2", "C:/Users/h/CloudStation/Projects/0/ly/lady/vendor/src/gopkg.in/vmihailenco/msgpack.v2", ClassVendor},
-		{"go.(*struct { net/http", ".", ClassSTD},
-		{"go.struct { net/http", ".", ClassSTD},
-		{"go.(*struct { sync.Mutex; table [64]math/big", ".", ClassSTD},
-		{"go.(*struct { sync.RWMutex; m map[reflect.Type][]encoding/json", ".", ClassSTD},
-		{"go.(*struct { sync.RWMutex; m map[reflect.Type]encoding/json", ".", ClassSTD},
 		{"hash", "C:/Go/src/hash", ClassSTD},
 		{"hash/crc32", "C:/Go/src/hash/crc32", ClassSTD},
 		{"internal/golang.org/x/net/http2/hpack", "C:/Go/src/internal/golang.org/x/net/http2/hpack", ClassSTD},
@@ -122,31 +109,18 @@ func TestClassifyPackage(t *testing.T) {
 		{"net", "C:/Go/src/runtime", ClassSTD},
 		{"net/http", "C:/Go/src/net/http", ClassSTD},
 		{"net/http/cookiejar", "C:/Go/src/net/http/cookiejar", ClassSTD},
-		{"net/http.(*envOnce).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*http2clientConnReadLoop).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*http2clientStream).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*http2responseWriterState).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*http2serverConn).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*http2stream).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*http2Transport).(net/http", "C:/Go/src/net/http", ClassSTD},
 		{"net/http/httputil", "C:/Go/src/net/http/httputil", ClassSTD},
 		{"net/http/internal", "C:/Go/src/net/http/internal", ClassSTD},
-		{"net/http.(*persistConn).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*response).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*Server).(net/http", "C:/Go/src/net/http", ClassSTD},
-		{"net/http.(*Transport).(net/http", "C:/Go/src/net/http", ClassSTD},
 		{"net/textproto", "C:/Go/src/net/textproto", ClassSTD},
 		{"net/url", "C:/Go/src/net/url", ClassSTD},
 		{"os", "C:/Go/src/runtime", ClassSTD},
 		{"os/exec", "C:/Go/src/os/exec", ClassSTD},
-		{"os/exec.(*closeOnce).(os/exec", "C:/Go/src/os/exec", ClassSTD},
 		{"os/user", "C:/Go/src/os/user", ClassSTD},
 		{"path", "C:/Go/src/path", ClassSTD},
 		{"path/filepath", "C:/Go/src/path/filepath", ClassSTD},
 		{"redis", "C:/Users/h/CloudStation/Projects/0/ly/lady/src/redis", ClassMain},
 		{"reflect", "C:/Go/src/runtime", ClassSTD},
 		{"regexp", "C:/Go/src/regexp", ClassSTD},
-		{"regexp.(*onePassInst).regexp/syntax", ".", ClassSTD},
 		{"regexp/syntax", "C:/Go/src/regexp/syntax", ClassSTD},
 		{"runtime", "C:/Go/src/runtime", ClassSTD},
 		{"runtime/debug", "C:/Go/src/runtime", ClassSTD},
@@ -160,8 +134,6 @@ func TestClassifyPackage(t *testing.T) {
 		{"syscall", "C:/Go/src/runtime", ClassSTD},
 		{"text/template", "C:/Go/src/text/template", ClassSTD},
 		{"text/template/parse", "C:/Go/src/text/template/parse", ClassSTD},
-		{"text/template.(*Template).text/template/parse", ".", ClassSTD},
-		{"text/template.Template.text/template/parse", ".", ClassSTD},
 		{"time", "C:/Go/src/runtime", ClassSTD},
 		{"type", "C:/Users/h/CloudStation/Projects/0/ly/lady/src/lady", ClassGenerated},
 		{"type..eq.[0]github.com/shirou/gopsutil/net", "C:/Users/h/CloudStation/Projects/0/ly/lady/vendor/src/github.com/shirou/gopsutil/net", ClassGenerated},