diff --git a/deps/v8/src/platform.h b/deps/v8/src/platform.h
index de896acad5..63a6e44550 100644
--- a/deps/v8/src/platform.h
+++ b/deps/v8/src/platform.h
@@ -71,6 +71,8 @@ int signbit(double x);
 
 int strncasecmp(const char* s1, const char* s2, int n);
 
+// Visual C++ 2013 and higher implement this function.
+#if (_MSC_VER < 1800)
 inline int lrint(double flt) {
   int intgr;
 #if defined(V8_TARGET_ARCH_IA32)
@@ -88,6 +90,7 @@ inline int lrint(double flt) {
   return intgr;
 }
 
+#endif  // _MSC_VER < 1800
 
 #endif  // _MSC_VER
 
diff --git a/deps/v8/src/preparser.cc b/deps/v8/src/preparser.cc
index 21da4f80d4..5ea5ffa65b 100644
--- a/deps/v8/src/preparser.cc
+++ b/deps/v8/src/preparser.cc
@@ -44,8 +44,8 @@
 
 namespace v8 {
 
-#ifdef _MSC_VER
-// Usually defined in math.h, but not in MSVC.
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
+// Usually defined in math.h, but not in MSVC until VS2013+.
 // Abstracted to work
 int isfinite(double value);
 #endif
diff --git a/deps/v8/src/win32-math.cc b/deps/v8/src/win32-math.cc
index 3410872bb5..c119710176 100644
--- a/deps/v8/src/win32-math.cc
+++ b/deps/v8/src/win32-math.cc
@@ -29,7 +29,7 @@
 // refer to The Open Group Base Specification for specification of the correct
 // semantics for these functions.
 // (http://www.opengroup.org/onlinepubs/000095399/)
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
 
 #undef V8_WIN32_LEAN_AND_MEAN
 #define V8_WIN32_HEADERS_FULL
diff --git a/deps/v8/src/win32-math.h b/deps/v8/src/win32-math.h
index 68759990b4..7e7c1c73ba 100644
--- a/deps/v8/src/win32-math.h
+++ b/deps/v8/src/win32-math.h
@@ -37,6 +37,8 @@
 #error Wrong environment, expected MSVC.
 #endif  // _MSC_VER
 
+// MSVC 2013+ provides implementations of all standard math functions.
+#if (_MSC_VER < 1800)
 enum {
   FP_NAN,
   FP_INFINITE,
@@ -58,4 +60,6 @@ int isgreater(double x, double y);
 int fpclassify(double x);
 int signbit(double x);
 
+#endif  // _MSC_VER < 1800
+
 #endif  // V8_WIN32_MATH_H_