diff --git a/libwebp/encode_test.go b/libwebp/encode_test.go
index de75b5b..d257884 100644
--- a/libwebp/encode_test.go
+++ b/libwebp/encode_test.go
@@ -30,7 +30,7 @@ type testCase struct {
 }
 
 var testCases = []testCase{
-	{"lossy", "source.jpg", options.EncodingOptions{Quality: 75, EncodingPreset: options.PresetPhoto, UseSharpYuv: true}},
+	{"lossy", "source.jpg", options.EncodingOptions{Quality: 75, EncodingPreset: options.EncodingPresetPhoto, UseSharpYuv: true}},
 	{"lossless", "source.jpg", options.EncodingOptions{}},
 	{"bw", "bw-gopher.png", options.EncodingOptions{Quality: 75}},
 }
diff --git a/libwebp/options/options.go b/libwebp/options/options.go
index 665094f..2410b08 100644
--- a/libwebp/options/options.go
+++ b/libwebp/options/options.go
@@ -1,12 +1,12 @@
 package options
 
 const (
-	PresetDefault EncodingPreset = iota
-	PresetPicture
-	PresetPhoto
-	PresetDrawing
-	PresetIcon
-	PresetText
+	EncodingPresetDefault EncodingPreset = iota
+	EncodingPresetPicture
+	EncodingPresetPhoto
+	EncodingPresetDrawing
+	EncodingPresetIcon
+	EncodingPresetText
 )
 
 type (