diff --git a/kernel/syscall.c b/kernel/syscall.c
index ed654094cb..664c39f748 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -145,3 +145,10 @@ syscall(void)
     p->trapframe->a0 = -1;
   }
 }
+// Inside syscall.c
+extern int sys_getfreemem(void);
+
+static int (*syscalls[])(void) = {
+    // Other system calls...
+    [SYS_getfreemem] sys_getfreemem,
+};