diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index 63528086337c0145b6e59e4a77c9e80b40686408..ce2d723c10e19d49495da09c585d122538bbbf89 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -161,7 +161,7 @@ static void timer_notify(struct pt_regs *regs, int cpu)
 		__trace_special(tr, data, 2, regs->ip, 0);
 
 		while (i < sample_max_depth) {
-			frame.next_fp = 0;
+			frame.next_fp = NULL;
 			frame.return_address = 0;
 			if (!copy_stack_frame(fp, &frame))
 				break;