1 files changed, 1 insertions, 0 deletions
diff --git a/src/pre.l b/src/pre.l
index 4c017da..2dafbde 100644
--- a/src/pre.l
+++ b/src/pre.l
@@ -232,6 +232,7 @@ class DefineManager
     Define *isDefined(const char *name) const
     {
       Define *d = m_contextDefines.find(name);
+      if (d && d->undef) d=0;
       //printf("isDefined(%s)=%p\n",name,d);
       return d;
     }