diff --git a/eBook/12.3.md b/eBook/12.3.md
index 6fe979d..24008d3 100644
--- a/eBook/12.3.md
+++ b/eBook/12.3.md
@@ -26,7 +26,7 @@ func CopyFile(dstName, srcName string) (written int64, err error) {
 	}
 	defer src.Close()
 
-	dst, err := os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE, 0644)
+	dst, err := os.Create(dstName)
 	if err != nil {
 		return
 	}