diff --git a/src/semaphore/src/lib.rs b/src/semaphore/src/lib.rs
index cd5bb47d79..676946c04c 100644
--- a/src/semaphore/src/lib.rs
+++ b/src/semaphore/src/lib.rs
@@ -49,12 +49,6 @@ pub extern "C" fn sem_wait(sem: *mut sem_t) -> c_int {
     unimplemented!();
 }
 
-#[no_mangle]
-pub extern "C" fn sem_timedwait(sem: *mut sem_t, abstime: *const timespec)
-     -> c_int {
-    unimplemented!();
-}
-
 #[no_mangle]
 pub extern "C" fn sem_trywait(sem: *mut sem_t) -> c_int {
     unimplemented!();