diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c
--- a/sys/kern/kern_synch.c
+++ b/sys/kern/kern_synch.c
@@ -87,7 +87,7 @@
  * Constants for averages over 1, 5, and 15 minutes
  * when sampling at 5 second intervals.
  */
-static fixpt_t cexp[3] = {
+static uint64_t cexp[3] = {
 	0.9200444146293232 * FSCALE,	/* exp(-1/12) */
 	0.9834714538216174 * FSCALE,	/* exp(-1/60) */
 	0.9944598480048967 * FSCALE,	/* exp(-1/180) */
@@ -611,14 +611,15 @@
 static void
 loadav(void *arg)
 {
-	int i, nrun;
+	int i;
+	uint64_t nrun;
 	struct loadavg *avg;
 
-	nrun = sched_load();
+	nrun = (uint64_t)sched_load();
 	avg = &averunnable;
 
 	for (i = 0; i < 3; i++)
-		avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
+		avg->ldavg[i] = (cexp[i] * (uint64_t)avg->ldavg[i] +
 		    nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
 
 	/*
diff --git a/sys/kern/tty_info.c b/sys/kern/tty_info.c
--- a/sys/kern/tty_info.c
+++ b/sys/kern/tty_info.c
@@ -302,7 +302,7 @@
 	sbuf_set_drain(&sb, sbuf_tty_drain, tp);
 
 	/* Print load average. */
-	load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
+	load = ((int64_t)averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
 	sbuf_printf(&sb, "%sload: %d.%02d ", tp->t_column == 0 ? "" : "\n",
 	    load / 100, load % 100);
 
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -361,12 +361,12 @@
  * Scale factor for scaled integers used to count %cpu time and load avgs.
  *
  * The number of CPU `tick's that map to a unique `%age' can be expressed
- * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
- * can be calculated (assuming 32 bits) can be closely approximated using
- * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
+ * by the formula (1 / (2 ^ (FSHIFT - 11))).  Since the intermediate
+ * calculation is done with 64-bit precision, the maximum load average that can
+ * be calculated is approximately 2^32 / FSCALE.
  *
  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
- * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
+ * FSHIFT must be at least 11.  This gives a maximum load avg of 2 million.
  */
 #define	FSHIFT	11		/* bits to right of fixed binary point */
 #define FSCALE	(1<<FSHIFT)