diff --git a/configs.go b/configs.go
index 87e1633..523c539 100644
--- a/configs.go
+++ b/configs.go
@@ -2264,17 +2264,17 @@ func (config SetStickerPositionConfig) params() (Params, error) {
 	return params, nil
 }
 
-// SetCustomEmojiStickerSetThumbnalConfig allows you to set the thumbnail of a custom emoji sticker set
-type SetCustomEmojiStickerSetThumbnalConfig struct {
+// SetCustomEmojiStickerSetThumbnailConfig allows you to set the thumbnail of a custom emoji sticker set
+type SetCustomEmojiStickerSetThumbnailConfig struct {
 	Name          string
 	CustomEmojiID string
 }
 
-func (config SetCustomEmojiStickerSetThumbnalConfig) method() string {
+func (config SetCustomEmojiStickerSetThumbnailConfig) method() string {
 	return "setCustomEmojiStickerSetThumbnail"
 }
 
-func (config SetCustomEmojiStickerSetThumbnalConfig) params() (Params, error) {
+func (config SetCustomEmojiStickerSetThumbnailConfig) params() (Params, error) {
 	params := make(Params)
 
 	params["name"] = config.Name
diff --git a/helpers.go b/helpers.go
index 4c7a074..4001d43 100644
--- a/helpers.go
+++ b/helpers.go
@@ -131,8 +131,8 @@ func NewSticker(chatID int64, file RequestFileData) StickerConfig {
 }
 
 // NewCustomEmojiStickerSetThumbnal creates a new setCustomEmojiStickerSetThumbnal request
-func NewCustomEmojiStickerSetThumbnal(name, customEmojiID string) SetCustomEmojiStickerSetThumbnalConfig {
-	return SetCustomEmojiStickerSetThumbnalConfig{
+func NewCustomEmojiStickerSetThumbnal(name, customEmojiID string) SetCustomEmojiStickerSetThumbnailConfig {
+	return SetCustomEmojiStickerSetThumbnailConfig{
 		Name:          name,
 		CustomEmojiID: customEmojiID,
 	}
diff --git a/types_test.go b/types_test.go
index 69c0593..90d01ea 100644
--- a/types_test.go
+++ b/types_test.go
@@ -359,7 +359,7 @@ var (
 	_ Chattable = ReopenGeneralForumTopicConfig{}
 	_ Chattable = HideGeneralForumTopicConfig{}
 	_ Chattable = UnhideGeneralForumTopicConfig{}
-	_ Chattable = SetCustomEmojiStickerSetThumbnalConfig{}
+	_ Chattable = SetCustomEmojiStickerSetThumbnailConfig{}
 	_ Chattable = SetStickerSetTitleConfig{}
 	_ Chattable = DeleteStickerSetConfig{}
 	_ Chattable = SetStickerEmojiListConfig{}