diff --git a/sudo.c b/sudo.c
index 328ece17c..04ee06a60 100644
--- a/sudo.c
+++ b/sudo.c
@@ -158,6 +158,9 @@ struct env_table badenv_table[] = {
 #if defined (__osf__) && defined(__alpha)
     { "_RLD_", 5 },
 #endif /* __alpha && __alpha */
+#ifdef HAVE_KERB4
+    { "KRB_CONF", 8 },
+#endif
     { "IFS=", 4 },
     { (char *) NULL, 0 }
 };