diff --git a/acconfig.h b/acconfig.h
index 5f869fa66e..dc5596dc80 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -33,6 +33,7 @@
 #undef HAVE_VORBIS
 #undef HAVE_LIBMAD
 #undef HAVE_LIBJPEG
+#undef HAVE_LIBSDL
 #undef HAVE_LIBHERMES
 #undef HAVE_NASM
 #undef HAVE_MPEG2DEC