diff --git a/Include/bytearrayobject.h b/Include/bytearrayobject.h
index 2c0b734..265b4bb 100644
--- a/Include/bytearrayobject.h
+++ b/Include/bytearrayobject.h
@@ -1,7 +1,7 @@
-/* Bytes object interface */
+/* ByteArray object interface */
 
-#ifndef Py_BYTESOBJECT_H
-#define Py_BYTESOBJECT_H
+#ifndef Py_BYTEARRAYOBJECT_H
+#define Py_BYTEARRAYOBJECT_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -50,4 +50,4 @@
 #ifdef __cplusplus
 }
 #endif
-#endif /* !Py_BYTESOBJECT_H */
+#endif /* !Py_BYTEARRAYOBJECT_H */
diff --git a/Include/bytesobject.h b/Include/bytesobject.h
index cb31da8..acb943b 100644
--- a/Include/bytesobject.h
+++ b/Include/bytesobject.h
@@ -1,8 +1,8 @@
 
-/* String object interface */
+/* Bytes (String) object interface */
 
-#ifndef Py_STRINGOBJECT_H
-#define Py_STRINGOBJECT_H
+#ifndef Py_BYTESOBJECT_H
+#define Py_BYTESOBJECT_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -197,4 +197,4 @@
 #ifdef __cplusplus
 }
 #endif
-#endif /* !Py_STRINGOBJECT_H */
+#endif /* !Py_BYTESOBJECT_H */