diff --git a/collects/net/dns.ss b/collects/net/dns.ss
index 3dff1a084c..b569eb6866 100644
--- a/collects/net/dns.ss
+++ b/collects/net/dns.ss
@@ -4,4 +4,5 @@
 (begin-elaboration-time
  (require-library "invoke.ss"))
 
-(define-values/invoke-unit/sig (require-relative-library "dnsr.ss"))
+(define-values/invoke-unit/sig mzlib:dns^
+  (require-relative-library "dnsr.ss"))