diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index a7aa446833aa32bed4733773eb71518d2e3a8fb8..a80ce8a778770ca09edd54beb24f7ef217607caa 100644
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -7,6 +7,7 @@
 #
 AC_DEFUN([LC_CONFIG_SRCDIR],
 [AC_CONFIG_SRCDIR([lustre/obdclass/obdo.c])
+libcfs_is_module=yes
 ])
 
 #