diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
index 2a4b8e18b3..b77e30357a 100644
--- a/hw/ppc/ppc.c
+++ b/hw/ppc/ppc.c
@@ -873,8 +873,9 @@ static int timebase_post_load(void *opaque, int version_id)
      */
     host_ns = qemu_clock_get_ns(QEMU_CLOCK_HOST);
     ns_diff = MAX(0, host_ns - tb_remote->time_of_the_day_ns);
-    migration_duration_ns = MIN(NSEC_PER_SEC, ns_diff);
-    migration_duration_tb = muldiv64(migration_duration_ns, freq, NSEC_PER_SEC);
+    migration_duration_ns = MIN(NANOSECONDS_PER_SECOND, ns_diff);
+    migration_duration_tb = muldiv64(migration_duration_ns, freq,
+                                     NANOSECONDS_PER_SECOND);
     guest_tb = tb_remote->guest_timebase + MIN(0, migration_duration_tb);
 
     tb_off_adj = guest_tb - cpu_get_real_ticks();
diff --git a/hw/ppc/spapr_rtc.c b/hw/ppc/spapr_rtc.c
index d20b8f270c..34b27db709 100644
--- a/hw/ppc/spapr_rtc.c
+++ b/hw/ppc/spapr_rtc.c
@@ -51,7 +51,7 @@ void spapr_rtc_read(DeviceState *dev, struct tm *tm, uint32_t *ns)
     assert(rtc);
 
     guest_ns = host_ns + rtc->ns_offset;
-    guest_s = guest_ns / NSEC_PER_SEC;
+    guest_s = guest_ns / NANOSECONDS_PER_SECOND;
 
     if (tm) {
         gmtime_r(&guest_s, tm);
@@ -71,7 +71,7 @@ int spapr_rtc_import_offset(DeviceState *dev, int64_t legacy_offset)
 
     rtc = SPAPR_RTC(dev);
 
-    rtc->ns_offset = legacy_offset * NSEC_PER_SEC;
+    rtc->ns_offset = legacy_offset * NANOSECONDS_PER_SECOND;
 
     return 0;
 }
@@ -146,7 +146,7 @@ static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 
     host_ns = qemu_clock_get_ns(rtc_clock);
 
-    rtc->ns_offset = (new_s * NSEC_PER_SEC) - host_ns;
+    rtc->ns_offset = (new_s * NANOSECONDS_PER_SECOND) - host_ns;
 
     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 }
@@ -168,7 +168,7 @@ static void spapr_rtc_realize(DeviceState *dev, Error **errp)
     qemu_get_timedate(&tm, 0);
     host_s = mktimegm(&tm);
     rtc_ns = qemu_clock_get_ns(rtc_clock);
-    rtc->ns_offset = host_s * NSEC_PER_SEC - rtc_ns;
+    rtc->ns_offset = host_s * NANOSECONDS_PER_SECOND - rtc_ns;
 
     object_property_add_tm(OBJECT(rtc), "date", spapr_rtc_qom_date, NULL);
 }
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index 954c34d6cc..a9f0efd5e0 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -56,7 +56,7 @@
 
 #define RTC_REINJECT_ON_ACK_COUNT 20
 #define RTC_CLOCK_RATE            32768
-#define UIP_HOLD_LENGTH           (8 * NSEC_PER_SEC / 32768)
+#define UIP_HOLD_LENGTH           (8 * NANOSECONDS_PER_SECOND / 32768)
 
 #define MC146818_RTC(obj) OBJECT_CHECK(RTCState, (obj), TYPE_MC146818_RTC)
 
@@ -105,7 +105,7 @@ static uint64_t get_guest_rtc_ns(RTCState *s)
     uint64_t guest_rtc;
     uint64_t guest_clock = qemu_clock_get_ns(rtc_clock);
 
-    guest_rtc = s->base_rtc * NSEC_PER_SEC
+    guest_rtc = s->base_rtc * NANOSECONDS_PER_SECOND
                  + guest_clock - s->last_update + s->offset;
     return guest_rtc;
 }
@@ -231,16 +231,17 @@ static void check_update_timer(RTCState *s)
         return;
     }
 
-    guest_nsec = get_guest_rtc_ns(s) % NSEC_PER_SEC;
+    guest_nsec = get_guest_rtc_ns(s) % NANOSECONDS_PER_SECOND;
     /* if UF is clear, reprogram to next second */
     next_update_time = qemu_clock_get_ns(rtc_clock)
-        + NSEC_PER_SEC - guest_nsec;
+        + NANOSECONDS_PER_SECOND - guest_nsec;
 
     /* Compute time of next alarm.  One second is already accounted
      * for in next_update_time.
      */
     next_alarm_sec = get_next_alarm(s);
-    s->next_alarm_time = next_update_time + (next_alarm_sec - 1) * NSEC_PER_SEC;
+    s->next_alarm_time = next_update_time +
+                         (next_alarm_sec - 1) * NANOSECONDS_PER_SECOND;
 
     if (s->cmos_data[RTC_REG_C] & REG_C_UF) {
         /* UF is set, but AF is clear.  Program the timer to target
@@ -456,7 +457,7 @@ static void cmos_ioport_write(void *opaque, hwaddr addr,
                 /* if disabling set mode, update the time */
                 if ((s->cmos_data[RTC_REG_B] & REG_B_SET) &&
                     (s->cmos_data[RTC_REG_A] & 0x70) <= 0x20) {
-                    s->offset = get_guest_rtc_ns(s) % NSEC_PER_SEC;
+                    s->offset = get_guest_rtc_ns(s) % NANOSECONDS_PER_SECOND;
                     rtc_set_time(s);
                 }
             }
@@ -580,7 +581,7 @@ static void rtc_update_time(RTCState *s)
     int64_t guest_nsec;
 
     guest_nsec = get_guest_rtc_ns(s);
-    guest_sec = guest_nsec / NSEC_PER_SEC;
+    guest_sec = guest_nsec / NANOSECONDS_PER_SECOND;
     gmtime_r(&guest_sec, &ret);
 
     /* Is SET flag of Register B disabled? */
@@ -608,7 +609,8 @@ static int update_in_progress(RTCState *s)
 
     guest_nsec = get_guest_rtc_ns(s);
     /* UIP bit will be set at last 244us of every second. */
-    if ((guest_nsec % NSEC_PER_SEC) >= (NSEC_PER_SEC - UIP_HOLD_LENGTH)) {
+    if ((guest_nsec % NANOSECONDS_PER_SECOND) >=
+        (NANOSECONDS_PER_SECOND - UIP_HOLD_LENGTH)) {
         return 1;
     }
     return 0;
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index d7cd40ba12..64a54c6e84 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -32,7 +32,7 @@
 #include "trace.h"
 
 #define FRAME_TIMER_FREQ 1000
-#define FRAME_TIMER_NS   (NSEC_PER_SEC / FRAME_TIMER_FREQ)
+#define FRAME_TIMER_NS   (NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ)
 #define UFRAME_TIMER_NS  (FRAME_TIMER_NS / 8)
 
 #define NB_MAXINTRATE    8        // Max rate at which controller issues ints
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 4dda20bc75..5923d600fd 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -5,7 +5,7 @@
 #include "qemu-common.h"
 #include "qemu/notify.h"
 
-#define NSEC_PER_SEC 1000000000LL
+#define NANOSECONDS_PER_SECOND 1000000000LL
 
 /* timers */
 
diff --git a/tests/rtl8139-test.c b/tests/rtl8139-test.c
index 3bff0e3cc6..e749be38ea 100644
--- a/tests/rtl8139-test.c
+++ b/tests/rtl8139-test.c
@@ -86,7 +86,7 @@ static void test_timer(void)
         fatal("time too big %u\n", curr);
     }
     for (cnt = 0; ; ) {
-        clock_step(1 * NSEC_PER_SEC);
+        clock_step(1 * NANOSECONDS_PER_SECOND);
         prev = curr;
         curr = in_Timer();
 
@@ -125,7 +125,7 @@ static void test_timer(void)
     out_IntrStatus(0x4000);
     curr = in_Timer();
     out_TimerInt(curr + 0.5 * CLK);
-    clock_step(1 * NSEC_PER_SEC);
+    clock_step(1 * NANOSECONDS_PER_SECOND);
     out_Timer(0);
     if ((in_IntrStatus() & 0x4000) == 0) {
         fatal("we should have an interrupt here!\n");
@@ -137,7 +137,7 @@ static void test_timer(void)
     out_IntrStatus(0x4000);
     curr = in_Timer();
     out_TimerInt(curr + 0.5 * CLK);
-    clock_step(1 * NSEC_PER_SEC);
+    clock_step(1 * NANOSECONDS_PER_SECOND);
     out_TimerInt(0);
     if ((in_IntrStatus() & 0x4000) == 0) {
         fatal("we should have an interrupt here!\n");
@@ -148,7 +148,7 @@ static void test_timer(void)
     next = curr + 5.0 * CLK;
     out_TimerInt(next);
     for (cnt = 0; ; ) {
-        clock_step(1 * NSEC_PER_SEC);
+        clock_step(1 * NANOSECONDS_PER_SECOND);
         prev = curr;
         curr = in_Timer();
         diff = (curr-prev) & 0xffffffffu;
diff --git a/tests/test-throttle.c b/tests/test-throttle.c
index 33b6b95b35..016844546a 100644
--- a/tests/test-throttle.c
+++ b/tests/test-throttle.c
@@ -40,19 +40,19 @@ static void test_leak_bucket(void)
     bkt.level = 1.5;
 
     /* leak an op work of time */
-    throttle_leak_bucket(&bkt, NSEC_PER_SEC / 150);
+    throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
     g_assert(bkt.avg == 150);
     g_assert(bkt.max == 15);
     g_assert(double_cmp(bkt.level, 0.5));
 
     /* leak again emptying the bucket */
-    throttle_leak_bucket(&bkt, NSEC_PER_SEC / 150);
+    throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
     g_assert(bkt.avg == 150);
     g_assert(bkt.max == 15);
     g_assert(double_cmp(bkt.level, 0));
 
     /* check that the bucket level won't go lower */
-    throttle_leak_bucket(&bkt, NSEC_PER_SEC / 150);
+    throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
     g_assert(bkt.avg == 150);
     g_assert(bkt.max == 15);
     g_assert(double_cmp(bkt.level, 0));
@@ -90,7 +90,7 @@ static void test_compute_wait(void)
     bkt.level = 15.5;
     wait = throttle_compute_wait(&bkt);
     /* time required to do half an operation */
-    result = (int64_t)  NSEC_PER_SEC / 150 / 2;
+    result = (int64_t)  NANOSECONDS_PER_SECOND / 150 / 2;
     g_assert(wait == result);
 }
 
diff --git a/tests/wdt_ib700-test.c b/tests/wdt_ib700-test.c
index 10a54720ff..82ca597252 100644
--- a/tests/wdt_ib700-test.c
+++ b/tests/wdt_ib700-test.c
@@ -40,29 +40,29 @@ static QDict *qmp_get_event(const char *name)
 
 static QDict *ib700_program_and_wait(QTestState *s)
 {
-    clock_step(NSEC_PER_SEC * 40);
+    clock_step(NANOSECONDS_PER_SECOND * 40);
     qmp_check_no_event();
 
     /* 2 second limit */
     outb(0x443, 14);
 
     /* Ping */
-    clock_step(NSEC_PER_SEC);
+    clock_step(NANOSECONDS_PER_SECOND);
     qmp_check_no_event();
     outb(0x443, 14);
 
     /* Disable */
-    clock_step(NSEC_PER_SEC);
+    clock_step(NANOSECONDS_PER_SECOND);
     qmp_check_no_event();
     outb(0x441, 1);
-    clock_step(3 * NSEC_PER_SEC);
+    clock_step(3 * NANOSECONDS_PER_SECOND);
     qmp_check_no_event();
 
     /* Enable and let it fire */
     outb(0x443, 13);
-    clock_step(3 * NSEC_PER_SEC);
+    clock_step(3 * NANOSECONDS_PER_SECOND);
     qmp_check_no_event();
-    clock_step(2 * NSEC_PER_SEC);
+    clock_step(2 * NANOSECONDS_PER_SECOND);
     return qmp_get_event("WATCHDOG");
 }
 
diff --git a/util/throttle.c b/util/throttle.c
index ec70476f8f..706c13111e 100644
--- a/util/throttle.c
+++ b/util/throttle.c
@@ -36,7 +36,7 @@ void throttle_leak_bucket(LeakyBucket *bkt, int64_t delta_ns)
     double leak;
 
     /* compute how much to leak */
-    leak = (bkt->avg * (double) delta_ns) / NSEC_PER_SEC;
+    leak = (bkt->avg * (double) delta_ns) / NANOSECONDS_PER_SECOND;
 
     /* make the bucket leak */
     bkt->level = MAX(bkt->level - leak, 0);
@@ -72,7 +72,7 @@ static void throttle_do_leak(ThrottleState *ts, int64_t now)
  */
 static int64_t throttle_do_compute_wait(double limit, double extra)
 {
-    double wait = extra * NSEC_PER_SEC;
+    double wait = extra * NANOSECONDS_PER_SECOND;
     wait /= limit;
     return wait;
 }