diff --git a/process_nix_test.go b/process_nix_test.go
index ed2aec2..2185ffa 100644
--- a/process_nix_test.go
+++ b/process_nix_test.go
@@ -1,4 +1,4 @@
-// +build darwin linux
+// +build darwin linux netbsd
 
 package ps
 
diff --git a/process_unix.go b/process_unix.go
index f4e8da2..8c89b7e 100644
--- a/process_unix.go
+++ b/process_unix.go
@@ -1,4 +1,4 @@
-// +build linux
+// +build linux netbsd
 
 package ps