diff --git a/m4/ac_lua_devel.m4 b/m4/ac_lua_devel.m4
index 9737d78..8d1df01 100644
--- a/m4/ac_lua_devel.m4
+++ b/m4/ac_lua_devel.m4
@@ -8,11 +8,12 @@ AC_ARG_WITH(lua,
                    [ac_cv_use_lua="$with_lua"], [ac_cv_use_lua="yes"])
 AC_CACHE_CHECK([whether to compile with Lua support], [ac_cv_use_lua], [ac_cv_use_lua=no])
 
-if test "xac_cv_use_lua" != "xno"; then 
+if test "x$ac_cv_use_lua" != "xno"; then 
 
 AC_DEFINE(HAVE_LUA, 1, [Define to 1 if you have Lua headers and libraries])
-AM_CONDITIONAL(USE_LUA, test "x$ac_cv_use_lua" != "x")
 
 fi
+
+AM_CONDITIONAL(USE_LUA, test "x$ac_cv_use_lua" != "xno")
 ])