diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
index 1c5fc9df374e..3b40689ecf68 100644
--- a/sbin/sysctl/sysctl.c
+++ b/sbin/sysctl/sysctl.c
@@ -70,6 +70,7 @@ static int	sysctl_all (int *oid, int len);
 static int	name2oid(char *, int *);
 
 static void	set_T_dev_t (char *, void **, size_t *);
+static int	set_IK(char *, int *);
 
 static void
 usage(void)
@@ -232,10 +233,17 @@ parse(char *string)
 
 		switch (kind & CTLTYPE) {
 			case CTLTYPE_INT:
-				intval = (int)strtol(newval, &endptr, 0);
-				if (endptr == newval || *endptr != '\0')
-					errx(1, "invalid integer '%s'",
-					    newval);
+				if (strcmp(fmt, "IK") == 0) {
+					if (!set_IK((char*)newval, &intval))
+						errx(1, "invalid value '%s'",
+						    newval);
+ 				} else {
+					intval = (int)strtol(newval, &endptr,
+					    0);
+					if (endptr == newval || *endptr != '\0')
+						errx(1, "invalid integer '%s'",
+						    newval);
+				}
 				newval = &intval;
 				newsize = sizeof(intval);
 				break;
@@ -443,6 +451,33 @@ set_T_dev_t (char *path, void **val, size_t *size)
 	*size = sizeof statb.st_rdev;
 }
 
+static int
+set_IK(char *str, int *val)
+{
+	float temp;
+	int len, kelv;
+	char *p, *endptr;
+
+	if ((len = strlen(str)) == 0)
+		return (0);
+	p = &str[len - 1];
+	if (*p == 'C' || *p == 'F') {
+		*p = '\0';
+		temp = strtof(str, &endptr);
+		if (endptr == str || *endptr != '\0')
+			return (0);
+		if (*p == 'F')
+			temp = (temp - 32) * 5 / 9;
+		kelv = temp * 10 + 2732;
+	} else {
+		kelv = (int)strtol(str, &endptr, 10);
+		if (endptr == str || *endptr != '\0')
+			return (0);
+	}
+	*val = kelv;
+	return (1);
+}
+
 /*
  * These functions uses a presently undocumented interface to the kernel
  * to walk the tree and get the type so it can print the value.
diff --git a/sys/dev/acpica/acpi_thermal.c b/sys/dev/acpica/acpi_thermal.c
index a384d7193327..eeb223405059 100644
--- a/sys/dev/acpica/acpi_thermal.c
+++ b/sys/dev/acpica/acpi_thermal.c
@@ -733,7 +733,6 @@ acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS)
 	return (EPERM);
 
     /* Check user-supplied value for sanity. */
-    temp = (temp * 10) + TZ_ZEROC;
     acpi_tz_sanity(sc, &temp, "user-supplied temp");
     if (temp == -1)
 	return (EINVAL);