diff --git a/scripts/qapi/gen.py b/scripts/qapi/gen.py
index b40f18eee3..3d81b90ab7 100644
--- a/scripts/qapi/gen.py
+++ b/scripts/qapi/gen.py
@@ -130,15 +130,12 @@ class QAPIGenCCode(QAPIGen):
         self._start_if = (ifcond, self._body, self._preamble)
 
     def end_if(self) -> None:
-        assert self._start_if
-        self._wrap_ifcond()
-        self._start_if = None
-
-    def _wrap_ifcond(self) -> None:
+        assert self._start_if is not None
         self._body = _wrap_ifcond(self._start_if[0],
                                   self._start_if[1], self._body)
         self._preamble = _wrap_ifcond(self._start_if[0],
                                       self._start_if[2], self._preamble)
+        self._start_if = None
 
     def get_content(self) -> str:
         assert self._start_if is None