diff --git a/ja/ebook/07.6.md b/ja/ebook/07.6.md
index 1ed50a10..14aa62f3 100644
--- a/ja/ebook/07.6.md
+++ b/ja/ebook/07.6.md
@@ -144,7 +144,7 @@
 			if err != nil {
 				fmt.Println(err)
 			}
-			e, err := strconv.Itoa("1023")
+			e, err := strconv.Atoi("1023")
 			if err != nil {
 				fmt.Println(err)
 			}