diff --git a/sys/dev/acpica/acpi_perf.c b/sys/dev/acpica/acpi_perf.c
index a8414d04c531..1956d7bd9ee7 100644
--- a/sys/dev/acpica/acpi_perf.c
+++ b/sys/dev/acpica/acpi_perf.c
@@ -401,7 +401,7 @@ acpi_px_settings(device_t dev, struct cf_setting *sets, int *count, int *type)
 	if (sets == NULL || count == NULL)
 		return (EINVAL);
 	if (*count < sc->px_count - sc->px_max_avail)
-		return (ENOMEM);
+		return (E2BIG);
 
 	/* Return a list of settings that are currently valid. */
 	y = 0;
diff --git a/sys/dev/acpica/acpi_throttle.c b/sys/dev/acpica/acpi_throttle.c
index 22aa71f989ff..51894c2ee8c3 100644
--- a/sys/dev/acpica/acpi_throttle.c
+++ b/sys/dev/acpica/acpi_throttle.c
@@ -329,7 +329,7 @@ acpi_thr_settings(device_t dev, struct cf_setting *sets, int *count, int *type)
 	if (sets == NULL || count == NULL)
 		return (EINVAL);
 	if (*count < CPU_MAX_SPEED)
-		return (ENOMEM);
+		return (E2BIG);
 
 	/* Return a list of valid settings for this driver. */
 	memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * CPU_MAX_SPEED);