diff --git a/configure.ac b/configure.ac
index 7140627244..939ba6dcf0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -249,7 +249,7 @@ m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-conf
 # ------------------------------------------------------------------------------
 have_dbus=no
 AC_ARG_ENABLE(dbus, AS_HELP_STRING([--disable-dbus], [disable usage of dbus-1 in tests]))
-AS_IF(["x$enable_dbus" != "xno"], [
+AS_IF([test "x$enable_dbus" != "xno"], [
         PKG_CHECK_MODULES(DBUS, [dbus-1 >= 1.3.2],
                 [AC_DEFINE(HAVE_DBUS, 1, [Define if dbus-1 library is available]) have_dbus=yes],
                 [have_dbus=no])