diff --git a/arch/um/include/common-offsets.h b/arch/um/include/common-offsets.h
index 54694693f40003881ed9bebd3441b3542c9d3c0a..0edab695ed4e3e665588435d6bb07074a1b692ad 100644
--- a/arch/um/include/common-offsets.h
+++ b/arch/um/include/common-offsets.h
@@ -34,3 +34,7 @@ DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
 DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
 
 DEFINE(UM_HZ, HZ);
+
+DEFINE(UM_USEC_PER_SEC, USEC_PER_SEC);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index a1b0804ee57b8681d0ae03a7193585644b3ad2b7..fbf0a87c6eaa80b681086f5cc32dd36f88208df5 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -249,8 +249,6 @@ extern int setjmp_wrapper(void (*proc)(void *, void *), ...);
 extern void os_dump_core(void);
 
 /* time.c */
-#define BILLION (1000 * 1000 * 1000)
-
 extern void idle_sleep(unsigned long long nsecs);
 extern int set_interval(void);
 extern int timer_one_shot(int ticks);
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 2acdc7efb2ac7a94e7cf9a361b6b2fbee0a38538..1ac746a9eae1aae17e7b715a70084f793560cd4b 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -17,7 +17,7 @@
  */
 unsigned long long sched_clock(void)
 {
-	return (unsigned long long)jiffies_64 * (1000000000 / HZ);
+	return (unsigned long long)jiffies_64 * (NSEC_PER_SEC / HZ);
 }
 
 void timer_handler(int sig, struct uml_pt_regs *regs)
@@ -118,8 +118,9 @@ void __init time_init(void)
 	timer_init();
 
 	nsecs = os_nsecs();
-	set_normalized_timespec(&wall_to_monotonic, -nsecs / BILLION,
-				-nsecs % BILLION);
-	set_normalized_timespec(&xtime, nsecs / BILLION, nsecs % BILLION);
+	set_normalized_timespec(&wall_to_monotonic, -nsecs / NSEC_PER_SEC,
+				-nsecs % NSEC_PER_SEC);
+	set_normalized_timespec(&xtime, nsecs / NSEC_PER_SEC,
+				nsecs % NSEC_PER_SEC);
 	late_time_init = setup_itimer;
 }
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 9936531a262078e82a2be1afffb2ed1f104787b5..8548f126d6287c0af594469644dd4109cce9069e 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -294,8 +294,8 @@ void userspace(struct uml_pt_regs *regs)
 
 	if (getitimer(ITIMER_VIRTUAL, &timer))
 		printk("Failed to get itimer, errno = %d\n", errno);
-	nsecs = timer.it_value.tv_sec * BILLION +
-		timer.it_value.tv_usec * 1000;
+	nsecs = timer.it_value.tv_sec * UM_NSEC_PER_SEC +
+		timer.it_value.tv_usec * UM_NSEC_PER_USEC;
 	nsecs += os_nsecs();
 
 	while (1) {
@@ -347,8 +347,10 @@ void userspace(struct uml_pt_regs *regs)
 				block_signals();
 				(*sig_info[sig])(sig, regs);
 				unblock_signals();
-				nsecs = timer.it_value.tv_sec * BILLION +
-					timer.it_value.tv_usec * 1000;
+				nsecs = timer.it_value.tv_sec *
+					UM_NSEC_PER_SEC +
+					timer.it_value.tv_usec *
+					UM_NSEC_PER_USEC;
 				nsecs += os_nsecs();
 				break;
 			case SIGIO:
@@ -395,7 +397,7 @@ __initcall(init_thread_regs);
 
 int copy_context_skas0(unsigned long new_stack, int pid)
 {
-	struct timeval tv = { .tv_sec = 0, .tv_usec = 1000000 / UM_HZ };
+	struct timeval tv = { .tv_sec = 0, .tv_usec = UM_USEC_PER_SEC / UM_HZ };
 	int err;
 	unsigned long current_stack = current_stub_stack();
 	struct stub_data *data = (struct stub_data *) current_stack;
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index 574b134f0502775ce5e120611b8c80d59ee28dec..e34e1effe0f59b53b7b12f0f733053643f7bee4f 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -14,7 +14,7 @@
 
 int set_interval(void)
 {
-	int usec = 1000000/UM_HZ;
+	int usec = UM_USEC_PER_SEC / UM_HZ;
 	struct itimerval interval = ((struct itimerval) { { 0, usec },
 							  { 0, usec } });
 
@@ -26,11 +26,11 @@ int set_interval(void)
 
 int timer_one_shot(int ticks)
 {
-	unsigned long usec = ticks * 1000000 / UM_HZ;
-	unsigned long sec = usec / 1000000;
+	unsigned long usec = ticks * UM_USEC_PER_SEC / UM_HZ;
+	unsigned long sec = usec / UM_USEC_PER_SEC;
 	struct itimerval interval;
 
-	usec %= 1000000;
+	usec %= UM_USEC_PER_SEC;
 	interval = ((struct itimerval) { { 0, 0 }, { sec, usec } });
 
 	if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
@@ -78,8 +78,8 @@ extern void alarm_handler(int sig, struct sigcontext *sc);
 
 void idle_sleep(unsigned long long nsecs)
 {
-	struct timespec ts = { .tv_sec	= nsecs / BILLION,
-			       .tv_nsec = nsecs % BILLION };
+	struct timespec ts = { .tv_sec	= nsecs / UM_NSEC_PER_SEC,
+			       .tv_nsec = nsecs % UM_NSEC_PER_SEC };
 
 	if (nanosleep(&ts, &ts) == 0)
 		alarm_handler(SIGVTALRM, NULL);