diff --git a/cmd/serve/ftp/ftp.go b/cmd/serve/ftp/ftp.go
index a925917a7..b6b038d04 100644
--- a/cmd/serve/ftp/ftp.go
+++ b/cmd/serve/ftp/ftp.go
@@ -1,6 +1,6 @@
 // Package ftp implements an FTP server for rclone
 
-//+build !plan9
+//+build !plan9,go1.13
 
 package ftp
 
diff --git a/cmd/serve/ftp/ftp_test.go b/cmd/serve/ftp/ftp_test.go
index 215f692d0..1d5698ea8 100644
--- a/cmd/serve/ftp/ftp_test.go
+++ b/cmd/serve/ftp/ftp_test.go
@@ -3,7 +3,7 @@
 //
 // We skip tests on platforms with troublesome character mappings
 
-//+build !windows,!darwin,!plan9
+//+build !windows,!darwin,!plan9,go1.13
 
 package ftp
 
diff --git a/cmd/serve/ftp/ftp_unsupported.go b/cmd/serve/ftp/ftp_unsupported.go
index 76b4b2ecf..9cda63eb7 100644
--- a/cmd/serve/ftp/ftp_unsupported.go
+++ b/cmd/serve/ftp/ftp_unsupported.go
@@ -1,7 +1,7 @@
 // Build  for unsupported platforms to stop go complaining
 // about "no buildable Go source files "
 
-// +build plan9
+// +build plan9 !go1.13
 
 package ftp