diff --git a/Include/pydebug.h b/Include/pydebug.h
index 756f1e6..279e360 100644
--- a/Include/pydebug.h
+++ b/Include/pydebug.h
@@ -17,6 +17,7 @@
 PyAPI_DATA(int) Py_TabcheckFlag;
 PyAPI_DATA(int) Py_IgnoreEnvironmentFlag;
 PyAPI_DATA(int) Py_DivisionWarningFlag;
+PyAPI_DATA(int) Py_DontWriteBytecodeFlag;
 
 /* this is a wrapper around getenv() that pays attention to
    Py_IgnoreEnvironmentFlag.  It should be used for getting variables like