diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index a876ff5e47dcb04c6b9c50b87d7803f0526396bc..3266f67da4f8a479e2a312841f072a0824cc29c2 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -10,8 +10,6 @@
 #include <syscall-nr.h>
 
 static void syscall_handler(struct intr_frame *);
-bool create(const char *file, unsigned initial_size);
-tid_t exec(const char *cmd_line);
 
 void syscall_init(void) {
   intr_register_int(0x30, 3, INTR_ON, syscall_handler, "syscall");