diff --git a/lib/VMCore/AsmWriter.cpp b/lib/VMCore/AsmWriter.cpp
index 7bec783b0d3..21d4566a080 100644
--- a/lib/VMCore/AsmWriter.cpp
+++ b/lib/VMCore/AsmWriter.cpp
@@ -733,7 +733,7 @@ static void WriteConstantInternal(raw_ostream &Out, const Constant *CV,
             ((StrVal[0] == '-' || StrVal[0] == '+') &&
              (StrVal[1] >= '0' && StrVal[1] <= '9'))) {
           // Reparse stringized version!
-          if (atof(StrVal.c_str()) == Val) {
+          if (APFloat(APFloat::IEEEdouble, StrVal).convertToDouble() == Val) {
             Out << StrVal.str();
             return;
           }