diff --git a/execfile_unix.go b/execfile_unix.go
index fd83f56..82c738b 100644
--- a/execfile_unix.go
+++ b/execfile_unix.go
@@ -1,4 +1,4 @@
-// +build unix
+//go:build unix
 
 package main
 
diff --git a/execfile_windows.go b/execfile_windows.go
index 4b3feef..3d6ef61 100644
--- a/execfile_windows.go
+++ b/execfile_windows.go
@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package main
 
diff --git a/init_windows.go b/init_windows.go
index 825069d..e76629b 100644
--- a/init_windows.go
+++ b/init_windows.go
@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package main
 
diff --git a/job_unix.go b/job_unix.go
index 1cfdd57..0a038b1 100644
--- a/job_unix.go
+++ b/job_unix.go
@@ -1,4 +1,5 @@
-// +build darwin unix
+//go:build unix
+
 package main
 
 import (
diff --git a/job_windows.go b/job_windows.go
index 140a5d1..26818b5 100644
--- a/job_windows.go
+++ b/job_windows.go
@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package main
 
diff --git a/pprof.go b/pprof.go
index 977eeb0..ac4ed55 100644
--- a/pprof.go
+++ b/pprof.go
@@ -1,4 +1,4 @@
-// +build pprof
+//go:build pprof
 
 package main
 
diff --git a/signal_unix.go b/signal_unix.go
index 921c4b8..1564d93 100644
--- a/signal_unix.go
+++ b/signal_unix.go
@@ -1,4 +1,4 @@
-// +build unix
+//go:build unix
 
 package main
 
diff --git a/signal_windows.go b/signal_windows.go
index 42a9fff..2ed3370 100644
--- a/signal_windows.go
+++ b/signal_windows.go
@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package main
 
diff --git a/vars_darwin.go b/vars_darwin.go
index 8ec83ba..43215d5 100644
--- a/vars_darwin.go
+++ b/vars_darwin.go
@@ -1,4 +1,4 @@
-// +build darwin
+//go:build darwin
 
 package main
 
diff --git a/vars_unix.go b/vars_unix.go
index 04a7a91..ae397cf 100644
--- a/vars_unix.go
+++ b/vars_unix.go
@@ -1,4 +1,4 @@
-// +build unix
+//go:build unix
 
 package main
 
diff --git a/vars_windows.go b/vars_windows.go
index d1bd7b6..f724fc2 100644
--- a/vars_windows.go
+++ b/vars_windows.go
@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package main