diff --git a/uvloop/includes/stdlib.pxi b/uvloop/includes/stdlib.pxi
index adf9806..21d69e6 100644
--- a/uvloop/includes/stdlib.pxi
+++ b/uvloop/includes/stdlib.pxi
@@ -135,7 +135,7 @@ cdef int ssl_SSL_ERROR_WANT_READ = ssl.SSL_ERROR_WANT_READ
 cdef int ssl_SSL_ERROR_WANT_WRITE = ssl.SSL_ERROR_WANT_WRITE
 cdef int ssl_SSL_ERROR_SYSCALL = ssl.SSL_ERROR_SYSCALL
 
-cdef uint64_t MAIN_THREAD_ID = <uint64_t><int64_t>threading.main_thread().ident
+cdef uint64_t MAIN_THREAD_ID = <uint64_t>threading.main_thread().ident
 cdef threading_Thread = threading.Thread
 
 cdef int subprocess_PIPE = subprocess.PIPE