diff --git a/acconfig.h b/acconfig.h
index c9786c19..55a2e430 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -7,6 +7,7 @@
 #undef HAVE_SSL
 #undef HAVE_SWAP
 #undef NSLOOKUP_COMMAND
+#undef HOST_COMMAND
 #undef PACKAGE_VERSION
 #undef PATH_TO_DIG
 #undef PATH_TO_FPING