diff --git a/js/src/ctypes/CTypes.cpp b/js/src/ctypes/CTypes.cpp
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index 763d6e6..8b04fc8 100644
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--- a/js/src/ctypes/CTypes.cpp
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+++ b/js/src/ctypes/CTypes.cpp
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@@ -1023,6 +1023,19 @@ static JS_ALWAYS_INLINE TargetType Convert(FromType d)
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return ConvertImpl<TargetType, FromType>::Convert(d);
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}
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+template<class Type>
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+class no_bug_numeric_digits
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+{
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+ public:
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+ static const int digits = numeric_limits<Type>::digits;
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+};
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+template<>
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+class no_bug_numeric_digits<unsigned long long>
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+{
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+ public:
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+ static const int digits = 64;
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+};
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+
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template<class TargetType, class FromType>
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static JS_ALWAYS_INLINE bool IsAlwaysExact()
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{
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@@ -1035,7 +1048,7 @@ static JS_ALWAYS_INLINE bool IsAlwaysExact()
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// 2) If FromType is signed, TargetType must also be signed. (Floating point
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// types are always signed.)
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// 3) If TargetType is an exact integral type, FromType must be also.
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- if (numeric_limits<TargetType>::digits < numeric_limits<FromType>::digits)
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+ if (numeric_limits<TargetType>::digits < no_bug_numeric_digits<FromType>::digits)
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return false;
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if (numeric_limits<FromType>::is_signed &&
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