diff --git a/Source/BuiltInBasicType.swift b/Source/BuiltInBasicType.swift
index 8e44c18..cc57ac5 100644
--- a/Source/BuiltInBasicType.swift
+++ b/Source/BuiltInBasicType.swift
@@ -118,6 +118,7 @@ fileprivate let formatter: NumberFormatter = {
     formatter.usesGroupingSeparator = false
     formatter.numberStyle = .decimal
     formatter.maximumFractionDigits = 16
+    formatter.locale = Locale(identifier: "EN")
     return formatter
 }()