diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 1f3873a..3e5df89 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -15,7 +15,7 @@
 #include <cstring>
 #include <stdexcept>
 
-#if _MSC_VER >= 1400 // VC++ 8.0
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400 // VC++ 8.0
 #pragma warning( disable : 4996 )   // disable warning about strdup being deprecated.
 #endif
 
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index ccf323a..bb76f7a 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -14,7 +14,7 @@
 #include <sstream>
 #include <iomanip>
 
-#if _MSC_VER >= 1400 // VC++ 8.0
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400 // VC++ 8.0
 #pragma warning( disable : 4996 )   // disable warning about strdup being deprecated.
 #endif