diff --git a/os/BUILD b/os/BUILD
index aefa0ee..dee2476 100644
--- a/os/BUILD
+++ b/os/BUILD
@@ -66,3 +66,8 @@
     name = "watchos",
     constraint_setting = ":os",
 )
+
+constraint_value(
+    name = "qnx",
+    constraint_setting = ":os",
+)