diff --git a/vlib/v/gen/c/comptime.v b/vlib/v/gen/c/comptime.v
index 89fb027382..ccfc8d8f72 100644
--- a/vlib/v/gen/c/comptime.v
+++ b/vlib/v/gen/c/comptime.v
@@ -559,6 +559,9 @@ fn (mut g Gen) comp_if_to_ifdef(name string, is_comptime_optional bool) ?string
 		'linux' {
 			return '__linux__'
 		}
+		'serenity' {
+			return '__serenity__'
+		}
 		'freebsd' {
 			return '__FreeBSD__'
 		}
diff --git a/vlib/v/pref/os.v b/vlib/v/pref/os.v
index 3bb6e3a3a6..15e0ac2db4 100644
--- a/vlib/v/pref/os.v
+++ b/vlib/v/pref/os.v
@@ -16,6 +16,7 @@ pub enum OS {
 	js // TODO
 	android
 	solaris
+	serenity
 	haiku
 	raw
 	all
@@ -34,6 +35,7 @@ pub fn os_from_string(os_str string) ?OS {
 		'dragonfly' { return .dragonfly }
 		'js' { return .js }
 		'solaris' { return .solaris }
+		'serenity' { return .serenity }
 		'android' { return .android }
 		'haiku' { return .haiku }
 		'raw' { return .raw }
@@ -57,6 +59,7 @@ pub fn (o OS) str() string {
 		.js { return 'JavaScript' }
 		.android { return 'Android' }
 		.solaris { return 'Solaris' }
+		.serenity { return 'serenity' }
 		.haiku { return 'Haiku' }
 		.raw { return 'Raw' }
 		.all { return 'all' }
@@ -88,6 +91,13 @@ pub fn get_host_os() OS {
 	$if dragonfly {
 		return .dragonfly
 	}
+	/*
+	// TODO: uncomment after regenerating vc.c
+	$if serenity {
+		return .serenity
+	}
+	*/
+
 	$if solaris {
 		return .solaris
 	}