diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 0a556628a255..28127bcb146d 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -532,17 +532,16 @@ static const struct sysrq_key_op *sysrq_key_table[62] = {
 /* key2index calculation, -1 on invalid index */
 static int sysrq_key_table_key2index(u8 key)
 {
-	int retval;
-
-	if ((key >= '0') && (key <= '9'))
-		retval = key - '0';
-	else if ((key >= 'a') && (key <= 'z'))
-		retval = key + 10 - 'a';
-	else if ((key >= 'A') && (key <= 'Z'))
-		retval = key + 36 - 'A';
-	else
-		retval = -1;
-	return retval;
+	switch (key) {
+	case '0' ... '9':
+		return key - '0';
+	case 'a' ... 'z':
+		return key - 'a' + 10;
+	case 'A' ... 'Z':
+		return key - 'A' + 10 + 26;
+	default:
+		return -1;
+	}
 }
 
 /*