diff --git a/configure.ac b/configure.ac
index 1815d698..1cc11b7d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -109,7 +109,7 @@ AC_DEFINE_UNQUOTED([AWESOME_COMPILE_BY], ["$aw_whoami"], [build user])
 
 AC_ARG_VAR([LUA], [Lua interpreter])
 AC_PATH_PROG([LUA], [lua], [:])
-test "x$LUA" = "x:" && AC_MSG_WARN([awesome compilation requires Lua])
+test "x$LUA" = "x" && AC_MSG_WARN([awesome compilation requires Lua])
 
 AS_AC_EXPAND(awesomelibdir, "$datarootdir/awesome/lib")
 AC_DEFINE_UNQUOTED([AWESOME_LUA_LIB_PATH], "${awesomelibdir}", [awesome lib path])