diff --git a/README.md b/README.md
index 5ef74f1..719686a 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ The [examples](./examples) directory contains example codes and images.
 package main
 
 import (
-	"github.com/harukasan/go-libwebp/examples/util"
+	"github.com/harukasan/go-libwebp/test/util"
 	"github.com/harukasan/go-libwebp/webp"
 )
 
@@ -45,7 +45,7 @@ import (
 	"bufio"
 	"image"
 
-	"github.com/harukasan/go-libwebp/examples/util"
+	"github.com/harukasan/go-libwebp/test/util"
 	"github.com/harukasan/go-libwebp/webp"
 )
 
diff --git a/examples/decode/decode.go b/examples/decode/decode.go
index 0c29b6e..24a393d 100644
--- a/examples/decode/decode.go
+++ b/examples/decode/decode.go
@@ -1,7 +1,7 @@
 package main
 
 import (
-	"github.com/harukasan/go-libwebp/examples/util"
+	"github.com/harukasan/go-libwebp/test/util"
 	"github.com/harukasan/go-libwebp/webp"
 )
 
diff --git a/examples/encode/encode.go b/examples/encode/encode.go
index f7f7c63..04383ae 100644
--- a/examples/encode/encode.go
+++ b/examples/encode/encode.go
@@ -4,7 +4,7 @@ import (
 	"bufio"
 	"image"
 
-	"github.com/harukasan/go-libwebp/examples/util"
+	"github.com/harukasan/go-libwebp/test/util"
 	"github.com/harukasan/go-libwebp/webp"
 )
 
diff --git a/examples/util/util.go b/test/util/util.go
similarity index 100%
rename from examples/util/util.go
rename to test/util/util.go
diff --git a/examples/util/util_test.go b/test/util/util_test.go
similarity index 94%
rename from examples/util/util_test.go
rename to test/util/util_test.go
index 56ae488..810f40a 100644
--- a/examples/util/util_test.go
+++ b/test/util/util_test.go
@@ -3,7 +3,7 @@ package util_test
 import (
 	"testing"
 
-	"github.com/harukasan/go-libwebp/examples/util"
+	"github.com/harukasan/go-libwebp/test/util"
 )
 
 var PNGFiles = []string{