diff --git a/common/math/integer.go b/common/math/integer.go
index da01c0a08..38ba7baf0 100644
--- a/common/math/integer.go
+++ b/common/math/integer.go
@@ -54,11 +54,11 @@ func (i *HexOrDecimal64) UnmarshalJSON(input []byte) error {
 
 // UnmarshalText implements encoding.TextUnmarshaler.
 func (i *HexOrDecimal64) UnmarshalText(input []byte) error {
-	int, ok := ParseUint64(string(input))
+	val, ok := ParseUint64(string(input))
 	if !ok {
 		return fmt.Errorf("invalid hex or decimal integer %q", input)
 	}
-	*i = HexOrDecimal64(int)
+	*i = HexOrDecimal64(val)
 	return nil
 }