diff --git a/src/nvtt/OutputOptions.cpp b/src/nvtt/OutputOptions.cpp
index 095d344..6bd09ec 100644
--- a/src/nvtt/OutputOptions.cpp
+++ b/src/nvtt/OutputOptions.cpp
@@ -26,22 +26,6 @@
 using namespace nvtt;
 
 
-static void defaultBeginImageCallback(int size, int width, int height, int depth, int face, int miplevel, void * userData) {
-	nvtt::OutputHandler * outputHandler = (nvtt::OutputHandler *)userData;
-	if (outputHandler != NULL) outputHandler->beginImage(size, width, height, depth, face, miplevel);
-}
-
-static bool defaultOutputCallback(const void * data, int size, void * userData) {
-	nvtt::OutputHandler * outputHandler = (nvtt::OutputHandler *)userData;
-	if (outputHandler != NULL) return outputHandler->writeData(data, size);
-}
-
-static void defaultErrorCallback(Error e, void * userData) {
-	nvtt::ErrorHandler * errorHandler = (nvtt::ErrorHandler *)userData;
-	if (errorHandler != NULL) errorHandler->error(e);
-}
-
-
 OutputOptions::OutputOptions() : m(*new OutputOptions::Private())
 {
 	reset();
@@ -63,10 +47,6 @@ void OutputOptions::reset()
 	m.outputHandler = NULL;
 	m.errorHandler = NULL;
 
-	m.beginImageCallback = defaultBeginImageCallback;
-	m.outputCallback = defaultOutputCallback;
-	m.errorCallback = defaultErrorCallback;
-
 	m.outputHeader = true;
 	m.container = Container_DDS;
 }
@@ -83,7 +63,6 @@ void OutputOptions::setFileName(const char * fileName)
 	{
 		m.outputHandler = oh;
 	}
-	m.outputCallback = defaultOutputCallback;
 }
 
 /// Set output handler.
@@ -95,7 +74,6 @@ void OutputOptions::setOutputHandler(OutputHandler * outputHandler)
 		m.fileName.reset();
 	}
 	m.outputHandler = outputHandler;
-	m.outputCallback = defaultOutputCallback;
 }
 
 /// Set error handler.
@@ -129,15 +107,15 @@ bool OutputOptions::Private::hasValidOutputHandler() const
 
 void OutputOptions::Private::beginImage(int size, int width, int height, int depth, int face, int miplevel) const
 {
-	beginImageCallback(size, width, height, depth, face, miplevel, outputHandler);
+	if (outputHandler != NULL) outputHandler->beginImage(size, width, height, depth, face, miplevel);
 }
 
 bool OutputOptions::Private::writeData(const void * data, int size) const
 {
-	return outputCallback(data, size, outputHandler);
+	if (outputHandler != NULL) return outputHandler->writeData(data, size);
 }
 
 void OutputOptions::Private::error(Error e) const
 {
-	errorCallback(e, errorHandler);
+	if (errorHandler != NULL) errorHandler->error(e);
 }
diff --git a/src/nvtt/OutputOptions.h b/src/nvtt/OutputOptions.h
index 7548bae..84121af 100644
--- a/src/nvtt/OutputOptions.h
+++ b/src/nvtt/OutputOptions.h
@@ -64,10 +64,6 @@ namespace nvtt
 		OutputHandler * outputHandler;
 		ErrorHandler * errorHandler;
 
-		BeginImageCallback * beginImageCallback;
-		OutputCallback * outputCallback;
-		ErrorCallback * errorCallback;
-
 		bool outputHeader;
 		Container container;
 		
diff --git a/src/nvtt/nvtt.h b/src/nvtt/nvtt.h
index a0e272d..499cd55 100644
--- a/src/nvtt/nvtt.h
+++ b/src/nvtt/nvtt.h
@@ -316,10 +316,6 @@ namespace nvtt
 		virtual void error(Error e) = 0;
 	};
 
-	typedef void (BeginImageCallback)(int size, int width, int height, int depth, int face, int miplevel, void *);
-	typedef bool (OutputCallback)(const void * data, int size, void *);
-	typedef void (ErrorCallback)(Error e, void *);
-
 	/// Container.
 	enum Container
 	{
@@ -346,10 +342,6 @@ namespace nvtt
 		NVTT_API void setOutputHandler(OutputHandler * outputHandler);
 		NVTT_API void setErrorHandler(ErrorHandler * errorHandler);
 
-		NVTT_API void setBeginImageCallback(BeginImageCallback * beginImageCallback);
-		NVTT_API void setOutputCallback(OutputCallback * outputCallback);
-		NVTT_API void setErrorCallback(ErrorCallback * errorCallback);
-
 		NVTT_API void setOutputHeader(bool outputHeader);
 		NVTT_API void setContainer(Container container);
 	};