diff --git a/src/components/main/servo.rc b/src/components/main/servo.rc
index a71364f62f9..93172d0e332 100755
--- a/src/components/main/servo.rc
+++ b/src/components/main/servo.rc
@@ -96,6 +96,7 @@ pub mod platform;
 #[path = "util/mod.rs"]
 pub mod util;
 
+#[cfg(not(test))]
 #[start]
 fn start(argc: int, argv: **u8, crate_map: *u8) -> int {
     do std::rt::start_on_main_thread(argc, argv, crate_map) {