diff --git a/configure.ac b/configure.ac
index 50d8902a..02619d4a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -194,8 +194,8 @@ AC_ARG_ENABLE(opt,
   ])
 ])
 
-AC_SUBST([MAINT])
-AC_SUBST(PKGCONFIG_LIBS_PRIVATE, $PKGCONFIG_LIBS_PRIVATE)
+AC_SUBST(MAINT)
+AC_SUBST(PKGCONFIG_LIBS_PRIVATE)
 
 AX_VALGRIND_CHECK