diff --git a/pathnames.h.in b/pathnames.h.in
index 2c394fd07..220c521c0 100644
--- a/pathnames.h.in
+++ b/pathnames.h.in
@@ -49,3 +49,7 @@
 #ifndef _PATH_VI
 #undef _PATH_VI
 #endif /* _PATH_VI */
+
+#ifndef _PATH_PWD
+#undef _PATH_PWD
+#endif /* _PATH_PWD */