diff --git a/components/uptime.c b/components/uptime.c
index 8f15d71..274b41b 100644
--- a/components/uptime.c
+++ b/components/uptime.c
@@ -1,59 +1,19 @@
 /* See LICENSE file for copyright and license details. */
+#include <time.h>
 #include <stdio.h>
 
 #include "../util.h"
 
-static const char *
-format(int uptime)
+const char *
+uptime(void)
 {
 	int h, m;
-
-	h = uptime / 3600;
-	m = (uptime - h * 3600) / 60;
-
+	struct timespec uptime;
+	if (clock_gettime(CLOCK_BOOTTIME, &uptime) < 0) {
+		warn("clock_gettime 'CLOCK_BOOTTIME'");
+		return NULL;
+	}
+	h = uptime.tv_sec / 3600;
+	m = uptime.tv_sec % 3600 / 60;
 	return bprintf("%dh %dm", h, m);
 }
-
-#if defined(__linux__)
-	#include <sys/sysinfo.h>
-
-	const char *
-	uptime(void)
-	{
-		int uptime;
-		struct sysinfo info;
-
-		sysinfo(&info);
-		uptime = info.uptime;
-
-		return format(uptime);
-	}
-#elif defined(__OpenBSD__)
-	#include <sys/sysctl.h>
-	#include <sys/time.h>
-
-	const char *
-	uptime(void)
-	{
-		int mib[2], uptime;
-		size_t size;
-		time_t now;
-		struct timeval boottime;
-
-		time(&now);
-
-		mib[0] = CTL_KERN;
-		mib[1] = KERN_BOOTTIME;
-
-		size = sizeof(boottime);
-
-		if (sysctl(mib, 2, &boottime, &size, NULL, 0) < 0) {
-			warn("sysctl 'KERN_BOOTTIME':");
-			return NULL;
-		}
-
-		uptime = now - boottime.tv_sec;
-
-		return format(uptime);
-	}
-#endif