diff --git a/api/instance/v1/instance_sdk.go b/api/instance/v1/instance_sdk.go
index 79b5aef6b..6939f4cba 100644
--- a/api/instance/v1/instance_sdk.go
+++ b/api/instance/v1/instance_sdk.go
@@ -1496,7 +1496,7 @@ type ServerType struct {
 	// Capabilities: capabilities.
 	Capabilities *ServerTypeCapabilities `json:"capabilities"`
 	// ScratchStorageMaxSize: maximum available scratch storage.
-	ScratchStorageMaxSize *uint64 `json:"scratch_storage_max_size"`
+	ScratchStorageMaxSize *scw.Size `json:"scratch_storage_max_size"`
 }
 
 // ServerTypeCapabilities: server type. capabilities.