diff --git a/backup_test.go b/backup_test.go
index cc5a0c5..0522a12 100644
--- a/backup_test.go
+++ b/backup_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package winio
 
 import (
diff --git a/ea_test.go b/ea_test.go
index 27db14f..1d2abd7 100644
--- a/ea_test.go
+++ b/ea_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package winio
 
 import (
diff --git a/pipe_test.go b/pipe_test.go
index bd26ea7..a4ddea5 100644
--- a/pipe_test.go
+++ b/pipe_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package winio
 
 import (
diff --git a/pkg/etw/eventdata.go b/pkg/etw/eventdata.go
index a524d89..abf1680 100644
--- a/pkg/etw/eventdata.go
+++ b/pkg/etw/eventdata.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package etw
 
 import (
diff --git a/pkg/etw/fieldopt.go b/pkg/etw/fieldopt.go
index d544a29..b5ea80a 100644
--- a/pkg/etw/fieldopt.go
+++ b/pkg/etw/fieldopt.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package etw
 
 import (
diff --git a/pkg/etw/providerglobal.go b/pkg/etw/providerglobal.go
index 6c7331d..ce3d305 100644
--- a/pkg/etw/providerglobal.go
+++ b/pkg/etw/providerglobal.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package etw
 
 import (
diff --git a/pkg/etwlogrus/hook_test.go b/pkg/etwlogrus/hook_test.go
index 117402d..6f3e7ae 100644
--- a/pkg/etwlogrus/hook_test.go
+++ b/pkg/etwlogrus/hook_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package etwlogrus
 
 import (
diff --git a/pkg/guid/guid_test.go b/pkg/guid/guid_test.go
index d7e2124..84629ee 100644
--- a/pkg/guid/guid_test.go
+++ b/pkg/guid/guid_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package guid
 
 import (
diff --git a/pkg/security/grantvmgroupaccess.go b/pkg/security/grantvmgroupaccess.go
index 2df31b6..fca2415 100644
--- a/pkg/security/grantvmgroupaccess.go
+++ b/pkg/security/grantvmgroupaccess.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package security
 
 import (
diff --git a/pkg/security/grantvmgroupaccess_test.go b/pkg/security/grantvmgroupaccess_test.go
index 3a1705f..fcbd850 100644
--- a/pkg/security/grantvmgroupaccess_test.go
+++ b/pkg/security/grantvmgroupaccess_test.go
@@ -1,3 +1,5 @@
+//+build windows
+
 package security
 
 import (
diff --git a/privileges_test.go b/privileges_test.go
index 5e94c48..36fe72f 100644
--- a/privileges_test.go
+++ b/privileges_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package winio
 
 import "testing"
diff --git a/sd_test.go b/sd_test.go
index a33925c..4f3d981 100644
--- a/sd_test.go
+++ b/sd_test.go
@@ -1,3 +1,5 @@
+// +build windows
+
 package winio
 
 import "testing"
diff --git a/wim/wim.go b/wim/wim.go
index 1d02e92..e3ca2f1 100644
--- a/wim/wim.go
+++ b/wim/wim.go
@@ -1,3 +1,5 @@
+// +build windows
+
 // Package wim implements a WIM file parser.
 //
 // WIM files are used to distribute Windows file system and container images.