diff --git a/env.c b/env.c
index bc61fb44d..4b2f03e05 100644
--- a/env.c
+++ b/env.c
@@ -142,6 +142,8 @@ static const char *initial_badenv_table[] = {
     "TERMCAP",			/* XXX - only if it starts with '/' */
     "ENV",
     "BASH_ENV",
+    "PS4",
+    "SHELLOPTS",
     NULL
 };