diff --git a/proxy/blackhole/blackhole.go b/proxy/blackhole/blackhole.go
index 0eeeb6c7..8bcc5f5e 100644
--- a/proxy/blackhole/blackhole.go
+++ b/proxy/blackhole/blackhole.go
@@ -1,4 +1,7 @@
+// +build !confonly
+
 // Package blackhole is an outbound handler that blocks all connections.
+
 package blackhole
 
 //go:generate errorgen