diff --git a/include/mapnik/jpeg_io.hpp b/include/mapnik/jpeg_io.hpp
index 370a187c0..90be38deb 100644
--- a/include/mapnik/jpeg_io.hpp
+++ b/include/mapnik/jpeg_io.hpp
@@ -35,10 +35,10 @@ extern "C"
 #include <jpeglib.h>
 }
 
-namespace mapnik {
-
 #define BUFFER_SIZE 4096
 
+namespace jpeg_detail {
+
 typedef struct
 {
     struct jpeg_destination_mgr pub;
@@ -76,6 +76,10 @@ inline void term_destination( j_compress_ptr cinfo)
     dest->out->flush();
 }
 
+}
+
+namespace mapnik {
+
 template <typename T1, typename T2>
 void save_as_jpeg(T1 & file,int quality, T2 const& image)
 {
@@ -89,11 +93,11 @@ void save_as_jpeg(T1 & file,int quality, T2 const& image)
     jpeg_create_compress(&cinfo);
 
     cinfo.dest = (struct jpeg_destination_mgr *)(*cinfo.mem->alloc_small)
-        ((j_common_ptr) &cinfo, JPOOL_PERMANENT, sizeof(dest_mgr));
-    dest_mgr * dest = (dest_mgr*) cinfo.dest;
-    dest->pub.init_destination = init_destination;
-    dest->pub.empty_output_buffer = empty_output_buffer;
-    dest->pub.term_destination = term_destination;
+        ((j_common_ptr) &cinfo, JPOOL_PERMANENT, sizeof(jpeg_detail::dest_mgr));
+    jpeg_detail::dest_mgr * dest = (jpeg_detail::dest_mgr*) cinfo.dest;
+    dest->pub.init_destination = jpeg_detail::init_destination;
+    dest->pub.empty_output_buffer = jpeg_detail::empty_output_buffer;
+    dest->pub.term_destination = jpeg_detail::term_destination;
     dest->out = &file;
 
     //jpeg_stdio_dest(&cinfo, fp);