diff --git a/Testing/Utilities/openJpegDecoder.cxx b/Testing/Utilities/openJpegDecoder.cxx
index 4311095d5c0ba32ae14aecb1cdf2fe5dee648230..9a8e918c2d1bf848ddd030918416f9c17ea95b41 100644
--- a/Testing/Utilities/openJpegDecoder.cxx
+++ b/Testing/Utilities/openJpegDecoder.cxx
@@ -46,21 +46,21 @@
 /**
 sample error debug callback expecting no client object
 */
-void error_callback(const char *msg, void *client_data) {
+void _openJpegDecoder_error_callback(const char *msg, void *client_data) {
 	(void)client_data;
 	fprintf(stdout, "[ERROR] %s", msg);
 }
 /**
 sample warning debug callback expecting no client object
 */
-void warning_callback(const char *msg, void *client_data) {
+void _openJpegDecoder_warning_callback(const char *msg, void *client_data) {
 	(void)client_data;
 	fprintf(stdout, "[WARNING] %s", msg);
 }
 /**
 sample debug callback expecting no client object
 */
-void info_callback(const char *msg, void *client_data) {
+void _openJpegDecoder_info_callback(const char *msg, void *client_data) {
 	(void)client_data;
 	fprintf(stdout, "[INFO] %s", msg);
 }
@@ -113,9 +113,9 @@ int openJpegDecoder(int argc, char * argv[])
 	}
 
 	/* catch events using our callbacks and give a local context */		
-	opj_set_info_handler(l_codec, info_callback,00);
-	opj_set_warning_handler(l_codec, warning_callback,00);
-	opj_set_error_handler(l_codec, error_callback,00);
+	opj_set_info_handler(l_codec, _openJpegDecoder_info_callback,00);
+	opj_set_warning_handler(l_codec, _openJpegDecoder_warning_callback,00);
+	opj_set_error_handler(l_codec, _openJpegDecoder_error_callback,00);
 	
 	if
 		(! opj_setup_decoder(l_codec,&l_param))
diff --git a/Testing/Utilities/openJpegEncoder.cxx b/Testing/Utilities/openJpegEncoder.cxx
index c36057c0f69c4aceceb71355a4949baa98902db1..deb93224a7bc406317e349899748fd9cd0cf9cf7 100644
--- a/Testing/Utilities/openJpegEncoder.cxx
+++ b/Testing/Utilities/openJpegEncoder.cxx
@@ -49,35 +49,35 @@
 /**
 sample error callback expecting a FILE* client object
 */
-void error_callback_file(const char *msg, void *client_data) {
+void _openJpegEncoder_error_callback_file(const char *msg, void *client_data) {
 	FILE *stream = (FILE*)client_data;
 	fprintf(stream, "[ERROR] %s", msg);
 }
 /**
 sample warning callback expecting a FILE* client object
 */
-void warning_callback_file(const char *msg, void *client_data) {
+void _openJpegEncoder_warning_callback_file(const char *msg, void *client_data) {
 	FILE *stream = (FILE*)client_data;
 	fprintf(stream, "[WARNING] %s", msg);
 }
 /**
 sample error debug callback expecting no client object
 */
-void error__callback(const char *msg, void *client_data) {
+void _openJpegEncoder_error_callback(const char *msg, void *client_data) {
 	(void)client_data;
 	fprintf(stdout, "[ERROR] %s", msg);
 }
 /**
 sample warning debug callback expecting no client object
 */
-void warning__callback(const char *msg, void *client_data) {
+void _openJpegEncoder_warning_callback(const char *msg, void *client_data) {
 	(void)client_data;
 	fprintf(stdout, "[WARNING] %s", msg);
 }
 /**
 sample debug callback expecting no client object
 */
-void info__callback(const char *msg, void *client_data) {
+void _openJpegEncoder_info_callback(const char *msg, void *client_data) {
 	(void)client_data;
 	fprintf(stdout, "[INFO] %s", msg);
 }
@@ -215,9 +215,9 @@ int openJpegEncoder(int argc, char * argv[])
 	}
 
 	/* catch events using our callbacks and give a local context */		
-	opj_set_info_handler(l_codec, info__callback,00);
-	opj_set_warning_handler(l_codec, warning__callback,00);
-	opj_set_error_handler(l_codec, error__callback,00);
+	opj_set_info_handler(l_codec, _openJpegEncoder_info_callback,00);
+	opj_set_warning_handler(l_codec, _openJpegEncoder_warning_callback,00);
+	opj_set_error_handler(l_codec, _openJpegEncoder_error_callback,00);
 	
 	l_image = opj_image_tile_create(NUM_COMPS,l_params,CLRSPC_SRGB);
 	if