diff --git a/Objects/genobject.c b/Objects/genobject.c
index a3eae6a..7cec290 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -217,10 +217,8 @@
 
 	/* First, check the traceback argument, replacing None with
 	   NULL. */
-	if (tb == Py_None) {
-		Py_DECREF(tb);
+	if (tb == Py_None)
 		tb = NULL;
-	}
 	else if (tb != NULL && !PyTraceBack_Check(tb)) {
 		PyErr_SetString(PyExc_TypeError,
 			"throw() third argument must be a traceback object");