diff --git a/userdata.go b/userdata.go
index 38cca86..20366b6 100644
--- a/userdata.go
+++ b/userdata.go
@@ -77,6 +77,8 @@ func (d *userData) Reset() {
 		if vc, ok := v.(io.Closer); ok {
 			vc.Close()
 		}
+		(*d)[i].value = nil
+		(*d)[i].key = nil
 	}
 	*d = (*d)[:0]
 }
@@ -92,6 +94,7 @@ func (d *userData) Remove(key any) {
 		if kv.key == key {
 			n--
 			args[i], args[n] = args[n], args[i]
+			args[n].key = nil
 			args[n].value = nil
 			args = args[:n]
 			*d = args
diff --git a/userdata_test.go b/userdata_test.go
index fd6a924..1e19044 100644
--- a/userdata_test.go
+++ b/userdata_test.go
@@ -3,7 +3,9 @@ package fasthttp
 import (
 	"fmt"
 	"reflect"
+	"runtime"
 	"testing"
+	"time"
 )
 
 func TestUserData(t *testing.T) {
@@ -118,3 +120,32 @@ func TestUserDataSetAndRemove(t *testing.T) {
 	testUserDataGet(t, &u, []byte(shortKey), "")
 	testUserDataGet(t, &u, []byte(longKey), "")
 }
+
+func TestUserData_GC(t *testing.T) {
+	t.Parallel()
+
+	var u userData
+	key := "foo"
+	final := make(chan struct{})
+
+	func() {
+		val := &RequestHeader{}
+		runtime.SetFinalizer(val, func(v *RequestHeader) {
+			close(final)
+		})
+
+		u.Set(key, val)
+	}()
+
+	u.Reset()
+	runtime.GC()
+
+	select {
+	case <-final:
+	case <-time.After(time.Second):
+		t.Fatalf("value is garbage collected")
+	}
+
+	// Keep u alive, otherwise val will always get garbage collected.
+	u.Set("bar", 1)
+}