diff --git a/models/common/enum/size.go b/models/common/enum/size.go
index a6ef1f4..939c599 100644
--- a/models/common/enum/size.go
+++ b/models/common/enum/size.go
@@ -22,7 +22,7 @@ func (t StorageSize) String() string {
 	return [...]string{"GB", "MB", "KB", "TB"}[t]
 }
 
-func (t StorageSize) SizeList() []StorageSize {
+func SizeList() []StorageSize {
 	return []StorageSize{GB, MB, KB, TB}
 }
 
@@ -49,6 +49,6 @@ func (t StorageType) String() string {
 	return [...]string{"FILE", "STREAM", "API", "DATABASE", "S3", "MEMORY", "HARDWARE"}[t]
 }
 
-func (t StorageType) TypeList() []StorageType {
+func TypeList() []StorageType {
 	return []StorageType{FILE, STREAM, API, DATABASE, S3, MEMORY, HARDWARE}
 }