diff --git a/sys_unsupported.go b/sys_unsupported.go
index b47bccf..746639a 100644
--- a/sys_unsupported.go
+++ b/sys_unsupported.go
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package wincred
@@ -17,6 +18,7 @@ const (
 
 	sysERROR_NOT_FOUND         = syscall.Errno(1)
 	sysERROR_INVALID_PARAMETER = syscall.Errno(1)
+	sysERROR_BAD_USERNAME      = syscall.Errno(1)
 )
 
 func sysCredRead(...interface{}) (*Credential, error) {