diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 4129984..9f2145a 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -51,9 +51,9 @@ std::string valueToString( double value )
 {
    char buffer[32];
 #ifdef __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), "%#.16g", value); 
 #else	
-   sprintf(buffer, "%.16g", value); 
+   sprintf(buffer, "%#.16g", value); 
 #endif
    char* ch = buffer + strlen(buffer) - 1;
    if (*ch != '0') return buffer; // nothing to truncate, so save time