diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 668390020..36e4c4c48 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -15,6 +15,10 @@
 #include <cstring>
 #include <istream>
 
+#if defined(_MSC_VER) && _MSC_VER < 1500 // VC++ 8.0 and below
+#define snprintf _snprintf
+#endif
+
 #if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0
 // Disable warning about strdup being deprecated.
 #pragma warning(disable : 4996)
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 62bdae12f..8eb7dc590 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -15,6 +15,12 @@
 #include <iomanip>
 #include <math.h>
 
+#if defined(_MSC_VER) && _MSC_VER < 1500 // VC++ 8.0 and below
+#include <float.h>
+#define isfinite _finite
+#define snprintf _snprintf
+#endif
+
 #if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0
 // Disable warning about strdup being deprecated.
 #pragma warning(disable : 4996)