diff --git a/resizer.go b/resizer.go
index 9c3d8b6..c9ffe5a 100644
--- a/resizer.go
+++ b/resizer.go
@@ -31,7 +31,7 @@ func resizer(buf []byte, o Options) ([]byte, error) {
 	o = applyDefaults(o, imageType)
 
 	// Ensure supported type
-	if !IsTypeSupported(o.Type) {
+	if !IsTypeSupportedSave(o.Type) {
 		return nil, errors.New("Unsupported image output type")
 	}