diff --git a/dec_int.go b/dec_int.go
index 64eab15..f9d351f 100644
--- a/dec_int.go
+++ b/dec_int.go
@@ -8,13 +8,14 @@ import (
 	"github.com/go-faster/errors"
 )
 
-var intDigits []int8
+var intDigits [256]int8
 
-const uint32SafeToMultiply10 = uint32(0xffffffff)/10 - 1
-const uint64SafeToMultiple10 = uint64(0xffffffffffffffff)/10 - 1
+const (
+	uint32SafeToMultiply10 = uint32(0xffffffff)/10 - 1
+	uint64SafeToMultiple10 = uint64(0xffffffffffffffff)/10 - 1
+)
 
 func init() {
-	intDigits = make([]int8, 256)
 	for i := 0; i < len(intDigits); i++ {
 		intDigits[i] = invalidCharForNumber
 	}