diff --git a/usr.bin/time/time.c b/usr.bin/time/time.c
--- a/usr.bin/time/time.c
+++ b/usr.bin/time/time.c
@@ -40,6 +40,7 @@
 #include <errno.h>
 #include <locale.h>
 #include <signal.h>
+#include <stdatomic.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -54,7 +55,7 @@
 static void siginfo(int);
 static void usage(void) __dead2;
 
-static volatile sig_atomic_t siginfo_recvd;
+static sig_atomic_t siginfo_recvd;
 static char decimal_point;
 static struct timespec before_ts;
 static int hflag, pflag;
@@ -125,6 +126,7 @@
 	(void)signal(SIGINFO, siginfo);
 	(void)siginterrupt(SIGINFO, 1);
 	while (wait4(pid, &status, 0, &ru) != pid) {
+		atomic_signal_fence(memory_order_acquire);
 		if (siginfo_recvd) {
 			siginfo_recvd = 0;
 			if (clock_gettime(CLOCK_MONOTONIC, &after))
@@ -296,4 +298,5 @@
 {
 
 	siginfo_recvd = 1;
+	atomic_signal_fence(memory_order_release);
 }