diff --git a/src/hb-unicode.cc b/src/hb-unicode.cc
index 5b44913bd35faeb0559dedb2c2482ede1701272f..ed99ca211dd04f567ee8f7cb56f42b33af7acd2a 100644
--- a/src/hb-unicode.cc
+++ b/src/hb-unicode.cc
@@ -133,7 +133,7 @@ hb_unicode_funcs_get_default (void)
 
 #ifdef HAVE_GLIB
   HB_UNICODE_FUNCS_IMPLEMENT(glib)
-#elif 0 && defined(HAVE_ICU)
+#elif defined(HAVE_ICU) && defined(HAVE_ICU_BUILTIN)
   HB_UNICODE_FUNCS_IMPLEMENT(icu)
 #elif defined(HAVE_UCDN)
   HB_UNICODE_FUNCS_IMPLEMENT(ucdn)