diff --git a/config/system-headers.mozbuild b/config/system-headers.mozbuild
index 028002a1d0..9dcb50fe5e 100644
--- a/config/system-headers.mozbuild
+++ b/config/system-headers.mozbuild
@@ -310,6 +310,7 @@ system_headers = [
     "getopt.h",
     "gio/gdesktopappinfo.h",
     "gio/gio.h",
+    "gio/gunixfdlist.h",
     "glibconfig.h",
     "glib.h",
     "glib-object.h",