diff --git a/src/net/lookup_unix.go b/src/net/lookup_unix.go
index 8030e3d99e..5a7472d933 100644
--- a/src/net/lookup_unix.go
+++ b/src/net/lookup_unix.go
@@ -21,7 +21,7 @@ var onceReadProtocols sync.Once
 // readProtocols loads contents of /etc/protocols into protocols map
 // for quick access.
 func readProtocols() {
-	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 a9a96a2323..0df6efe9e5 100644
--- a/src/net/port_unix.go
+++ b/src/net/port_unix.go
@@ -17,7 +17,7 @@ import (
 var onceReadServices sync.Once

 func readServices() {
-	file, err := open("/etc/services")
+	file, err := open("@iana@/etc/services")
 	if err != nil {
 		return
 	}