diff --git a/fs/proc/array.c b/fs/proc/array.c
index eba339e..65c62e1 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -374,7 +374,9 @@
 	stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
 			cputime_to_clock_t(task_utime(p));
 
-	p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
+	if (stime >= 0)
+		p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
+
 	return p->prev_stime;
 }
 #endif