diff --git a/configure.ac b/configure.ac
index 14c4fbf..e87a2e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -801,6 +801,7 @@
    tmpdir="$withval",
    tmpdir="/tmp")
 AC_DEFINE_UNQUOTED(VG_TMPDIR, "$tmpdir", [Temporary files directory])
+AC_SUBST(VG_TMPDIR, [$tmpdir])
 
 
 #----------------------------------------------------------------------------