diff --git a/src/net/lookup_unix.go b/src/net/lookup_unix.go
index 7416cb01f8..62722cab14 100644
--- a/src/net/lookup_unix.go
+++ b/src/net/lookup_unix.go
@@ -15,7 +15,7 @@ import (
 // readProtocolsOnce loads contents of /etc/protocols into protocols map
 // for quick access.
 var readProtocolsOnce = sync.OnceFunc(func() {
-	file, err := open("/etc/protocols")
+	file, err := open("@iana@/etc/protocols")
 	if err != nil {
 		return
 	}
diff --git a/src/net/port_unix.go b/src/net/port_unix.go
index df73dbabb3..a5dcf2ca1c 100644
--- a/src/net/port_unix.go
+++ b/src/net/port_unix.go
@@ -16,7 +16,7 @@ import (
 var onceReadServices sync.Once
 
 func readServices() {
-	file, err := open("/etc/services")
+	file, err := open("@iana@/etc/services")
 	if err != nil {
 		return
 	}