diff --git a/Modules/_codecsmodule.c b/Modules/_codecsmodule.c
index de5270d..1199671 100644
--- a/Modules/_codecsmodule.c
+++ b/Modules/_codecsmodule.c
@@ -533,8 +533,7 @@
 			  &data, &size, &errors))
 	return NULL;
 
-    return codec_tuple(PyString_FromStringAndSize(data, size),
-		       size);
+    return codec_tuple(PyBytes_FromStringAndSize(data, size), size);
 }
 
 static PyObject *
@@ -549,8 +548,7 @@
 			  &data, &size, &errors))
 	return NULL;
 
-    return codec_tuple(PyString_FromStringAndSize(data, size),
-		       size);
+    return codec_tuple(PyBytes_FromStringAndSize(data, size), size);
 }
 
 static PyObject *
@@ -569,14 +567,12 @@
     if (PyUnicode_Check(obj)) {
 	data = PyUnicode_AS_DATA(obj);
 	size = PyUnicode_GET_DATA_SIZE(obj);
-	return codec_tuple(PyString_FromStringAndSize(data, size),
-			   size);
+	return codec_tuple(PyBytes_FromStringAndSize(data, size), size);
     }
     else {
 	if (PyObject_AsReadBuffer(obj, (const void **)&data, &size))
 	    return NULL;
-	return codec_tuple(PyString_FromStringAndSize(data, size),
-			   size);
+	return codec_tuple(PyBytes_FromStringAndSize(data, size), size);
     }
 }