diff --git a/vlib/os/os.v b/vlib/os/os.v
index f43a1ac8e0..2df87dc321 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -310,6 +310,12 @@ pub fn user_os() string {
 	$if haiku {
 		return 'haiku'
 	}
+	$if serenity {
+		return 'serenity'
+	}
+	$if vinix {
+		return 'vinix'
+	}
 	return 'unknown'
 }
 
diff --git a/vlib/v/pref/os.v b/vlib/v/pref/os.v
index 929db54e5a..bc1e560a60 100644
--- a/vlib/v/pref/os.v
+++ b/vlib/v/pref/os.v
@@ -97,10 +97,9 @@ pub fn get_host_os() OS {
 	$if serenity {
 		return .serenity
 	}
-	// TODO: uncomment the vinix block after v.c is regenerated
-	// $if vinix {
-	//	return .vinix
-	// }
+	$if vinix {
+		return .vinix
+	}
 	$if solaris {
 		return .solaris
 	}