--- a/src/pkg/net/cgo_bsd.go
+++ b/src/pkg/net/cgo_bsd.go
@@ -12,5 +12,5 @@ package net
 import "C"
 
 func cgoAddrInfoMask() C.int {
-	return C.AI_MASK
+	return C.AI_CANONNAME | C.AI_V4MAPPED | C.AI_ALL
 }