diff --git a/src/cpp/json/json_writer.cpp b/src/cpp/json/json_writer.cpp
index 2a9f0dba3a..5ab619d7b7 100644
--- a/src/cpp/json/json_writer.cpp
+++ b/src/cpp/json/json_writer.cpp
@@ -67,9 +67,9 @@ std::string valueToString( double value )
 {
    char buffer[32];
 #if defined(_MSC_VER) && defined(__STDC_SECURE_LIB__) // Use secure version with visual studio 2005 to avoid warning. 
-   sprintf_s(buffer, sizeof(buffer), "%#.16g", value); 
+   sprintf_s(buffer, sizeof(buffer), "%#f", value);
 #else	
-   sprintf(buffer, "%#.16g", value); 
+   sprintf(buffer, "%#f", value);
 #endif
    char* ch = buffer + strlen(buffer) - 1;
    if (*ch != '0') return buffer; // nothing to truncate, so save time