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diff --git a/intl/icu/source/i18n/fmtableimp.h b/intl/icu/source/i18n/fmtableimp.h
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+++ b/intl/icu/source/i18n/fmtableimp.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2010-2014, International Business Machines Corporation and    *
+* others. All Rights Reserved.                                                *
+*******************************************************************************
+*/
+
+#ifndef FMTABLEIMP_H
+#define FMTABLEIMP_H
+
+#include "number_decimalquantity.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+U_NAMESPACE_BEGIN
+
+/** 
+ * Maximum int64_t value that can be stored in a double without chancing losing precision.
+ *   IEEE doubles have 53 bits of mantissa, 10 bits exponent, 1 bit sign.
+ *   IBM Mainframes have 56 bits of mantissa, 7 bits of base 16 exponent, 1 bit sign.
+ * Define this constant to the smallest value from those for supported platforms.
+ * @internal
+ */
+static const int64_t MAX_INT64_IN_DOUBLE = 0x001FFFFFFFFFFFFFLL;
+
+U_NAMESPACE_END
+
+#endif // #if !UCONFIG_NO_FORMATTING
+#endif