Index: gdal/ogr/ogrsf_frmts/geojson/ogrgeojsonwriter.cpp
===================================================================
--- a/ogr/ogrsf_frmts/geojson/ogrgeojsonwriter.cpp	(revision 41042)
+++ b/ogr/ogrsf_frmts/geojson/ogrgeojsonwriter.cpp	(revision 41043)
@@ -28,4 +28,6 @@
  ****************************************************************************/
 
+#define JSON_C_VER_013 (13 << 8)
+
 #include "ogrgeojsonwriter.h"
 #include "ogrgeojsonutils.h"
@@ -33,5 +35,9 @@
 #include "ogrgeojsonreader.h"
 #include <json.h>  // JSON-C
+
+#if (!defined(JSON_C_VERSION_NUM)) || (JSON_C_VERSION_NUM < JSON_C_VER_013)
 #include <json_object_private.h>
+#endif
+
 #include <printbuf.h>
 #include <ogr_api.h>
@@ -1382,11 +1388,15 @@
     // TODO(schwehr): Explain this casting.
     const int nPrecision =
+#if (!defined(JSON_C_VERSION_NUM)) || (JSON_C_VERSION_NUM < JSON_C_VER_013)
         static_cast<int>(reinterpret_cast<GUIntptr_t>(jso->_userdata));
+#else
+        static_cast<int>(reinterpret_cast<GUIntptr_t>(json_object_get_userdata(jso)));
+#endif
     char szBuffer[75] = {};
-    OGRFormatDouble( szBuffer, sizeof(szBuffer), jso->o.c_double, '.',
+    OGRFormatDouble( szBuffer, sizeof(szBuffer), json_object_get_double(jso), '.',
                      (nPrecision < 0) ? 15 : nPrecision );
     if( szBuffer[0] == 't' /*oobig */ )
     {
-        CPLsnprintf(szBuffer, sizeof(szBuffer), "%.18g", jso->o.c_double);
+        CPLsnprintf(szBuffer, sizeof(szBuffer), "%.18g", json_object_get_double(jso));
     }
     return printbuf_memappend(pb, szBuffer, static_cast<int>(strlen(szBuffer)));
@@ -1418,9 +1428,9 @@
     char szBuffer[75] = {};
     int nSize = 0;
-    if( CPLIsNan(jso->o.c_double))
+    if( CPLIsNan(json_object_get_double(jso)))
         nSize = CPLsnprintf(szBuffer, sizeof(szBuffer), "NaN");
-    else if( CPLIsInf(jso->o.c_double) )
-    {
-        if( jso->o.c_double > 0 )
+    else if( CPLIsInf(json_object_get_double(jso)) )
+    {
+        if( json_object_get_double(jso) > 0 )
             nSize = CPLsnprintf(szBuffer, sizeof(szBuffer), "Infinity");
         else
@@ -1430,5 +1440,9 @@
     {
         char szFormatting[32] = {};
+#if (!defined(JSON_C_VERSION_NUM)) || (JSON_C_VERSION_NUM < JSON_C_VER_013)
         const int nSignificantFigures = (int) (GUIntptr_t) jso->_userdata;
+#else
+        const int nSignificantFigures = (int) (GUIntptr_t) json_object_get_userdata(jso);
+#endif
         const int nInitialSignificantFigures =
             nSignificantFigures >= 0 ? nSignificantFigures : 17;
@@ -1436,5 +1450,5 @@
                     "%%.%dg", nInitialSignificantFigures);
         nSize = CPLsnprintf(szBuffer, sizeof(szBuffer),
-                            szFormatting, jso->o.c_double);
+                            szFormatting, json_object_get_double(jso));
         const char* pszDot = NULL;
         if( nSize+2 < static_cast<int>(sizeof(szBuffer)) &&
@@ -1458,5 +1472,5 @@
                             "%%.%dg", nInitialSignificantFigures- i);
                 nSize = CPLsnprintf(szBuffer, sizeof(szBuffer),
-                                    szFormatting, jso->o.c_double);
+                                    szFormatting, json_object_get_double(jso));
                 pszDot = strchr(szBuffer, '.');
                 if( pszDot != NULL &&
@@ -1473,5 +1487,5 @@
                             "%%.%dg", nInitialSignificantFigures);
                 nSize = CPLsnprintf(szBuffer, sizeof(szBuffer),
-                                    szFormatting, jso->o.c_double);
+                                    szFormatting, json_object_get_double(jso));
                 if( nSize+2 < static_cast<int>(sizeof(szBuffer)) &&
                     strchr(szBuffer, '.') == NULL )