diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 29dc700..c9cf48b 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -574,7 +574,7 @@
 #define arch_ptrace_attach(child)	do { } while (0)
 #endif
 
-asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
+SYSCALL_DEFINE4(ptrace, long, request, long, pid, long, addr, long, data)
 {
 	struct task_struct *child;
 	long ret;