diff --git a/ui-sys/build.rs b/ui-sys/build.rs
index 65d9ea061..3ff7792db 100644
--- a/ui-sys/build.rs
+++ b/ui-sys/build.rs
@@ -259,6 +259,7 @@ fn main() {
                 "darwin/drawtext.m",
                 "darwin/editablecombo.m",
                 "darwin/entry.m",
+                "darwin/event.m",
                 "darwin/fontbutton.m",
                 "darwin/fontmatch.m",
                 "darwin/fonttraits.m",