diff --git a/include/ucore/read_file.h b/include/ucore/read_file.h
index 26e4987..e105b45 100644
--- a/include/ucore/read_file.h
+++ b/include/ucore/read_file.h
@@ -1,5 +1,5 @@
 #ifndef UC_READ_FILE_H_
-#define UC_READ_FILE_H_y
+#define UC_READ_FILE_H_
 
 #include <stddef.h>