diff --git a/std/conv.d b/std/conv.d
index 208bafd67a2..79fc964902e 100644
--- a/std/conv.d
+++ b/std/conv.d
@@ -2957,12 +2957,19 @@ unittest
     ld = parse!real(s2);
     assert(s2.empty);
     x = *cast(longdouble *)&ld;
-    version (CRuntime_Microsoft)
-        ld1 = 0x1.FFFFFFFFFFFFFFFEp-16382L; // strtold currently mapped to strtod
-    else version (Android)
-        ld1 = 0x1.FFFFFFFFFFFFFFFEp-16382L; // strtold currently mapped to strtod
+
+    static if(real.mant_dig == 64)
+    {
+        version (CRuntime_Microsoft)
+            ld1 = 0x1.FFFFFFFFFFFFFFFEp-16382L; // strtold currently mapped to strtod
+        else version (Android)
+            ld1 = 0x1.FFFFFFFFFFFFFFFEp-16382L; // strtold currently mapped to strtod
+        else
+            ld1 = strtold(s.ptr, null);
+    }
     else
         ld1 = strtold(s.ptr, null);
+
     x1 = *cast(longdouble *)&ld1;
     assert(x1 == x && ld1 == ld);
 
diff --git a/std/format.d b/std/format.d
index 20581e98923..72c6dab8f7b 100644
--- a/std/format.d
+++ b/std/format.d
@@ -3686,7 +3686,8 @@ unittest
     }
     else version (CRuntime_Microsoft)
     {
-        assert(stream.data == "1.67 -0X1.47AE14P+0 nan",
+        assert(stream.data == "1.67 -0X1.47AE14P+0 nan"
+            || stream.data == "1.67 -0X1.47AE147AE147BP+0 nan", // MSVCRT 14+ (VS 2015)
                 stream.data);
     }
     else version (Android)
@@ -3722,7 +3723,8 @@ unittest
     formattedWrite(stream, "%a %A", 1.32, 6.78f);
     //formattedWrite(stream, "%x %X", 1.32);
     version (CRuntime_Microsoft)
-        assert(stream.data == "0x1.51eb85p+0 0X1.B1EB86P+2");
+        assert(stream.data == "0x1.51eb85p+0 0X1.B1EB86P+2"
+            || stream.data == "0x1.51eb851eb851fp+0 0X1.B1EB860000000P+2"); // MSVCRT 14+ (VS 2015)
     else version (Android)
     {
         // bionic doesn't support hex formatting of floating point numbers,
@@ -6204,7 +6206,8 @@ unittest
     version (MinGW)
         assert(s == "1.67 -0XA.3D70A3D70A3D8P-3 nan", s);
     else version (CRuntime_Microsoft)
-        assert(s == "1.67 -0X1.47AE14P+0 nan", s);
+        assert(s == "1.67 -0X1.47AE14P+0 nan"
+            || s == "1.67 -0X1.47AE147AE147BP+0 nan", s); // MSVCRT 14+ (VS 2015)
     else version (Android)
     {
         // bionic doesn't support hex formatting of floating point numbers
diff --git a/std/outbuffer.d b/std/outbuffer.d
index 20b76c5e08a..ee4a1da38f0 100644
--- a/std/outbuffer.d
+++ b/std/outbuffer.d
@@ -269,7 +269,7 @@ class OutBuffer
         {
             version(Windows)
             {
-                count = _vsnprintf(p,psize,f,args);
+                count = vsnprintf(p,psize,f,args);
                 if (count != -1)
                     break;
                 psize *= 2;
diff --git a/std/stream.d b/std/stream.d
index c52c27d564a..d1e5a2ccb43 100644
--- a/std/stream.d
+++ b/std/stream.d
@@ -1181,7 +1181,7 @@ class Stream : InputStream, OutputStream {
     size_t count;
     while (true) {
       version (Windows) {
-        count = _vsnprintf(p, psize, f, args);
+        count = vsnprintf(p, psize, f, args);
         if (count != -1)
           break;
         psize *= 2;