diff --git a/os/BUILD b/os/BUILD
index 2c2d281..96df162 100644
--- a/os/BUILD
+++ b/os/BUILD
@@ -28,6 +28,11 @@ constraint_value(
     constraint_setting = ":os",
 )
 
+constraint_value(
+    name = "haiku",
+    constraint_setting = ":os",
+)
+
 constraint_value(
     name = "android",
     constraint_setting = ":os",