diff --git a/src/nvtt/squish/colourfit.cpp b/src/nvtt/squish/colourfit.cpp
index f67a67f..6dcc076 100644
--- a/src/nvtt/squish/colourfit.cpp
+++ b/src/nvtt/squish/colourfit.cpp
@@ -22,7 +22,7 @@
 	SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 	
    -------------------------------------------------------------------------- */
-   
+
 #include "colourfit.h"
 #include "colourset.h"
 
@@ -38,21 +38,21 @@ void ColourFit::SetColourSet( ColourSet const* colours, int flags )
 	m_flags = flags;
 }
 
-void ColourFit::Compress( Vec3 * start, Vec3 * end )
+void ColourFit::Compress( void* block )
 {
 	bool isDxt1 = ( ( m_flags & kDxt1 ) != 0 );
 	if( isDxt1 )
 	{
-		Compress3( start, end );
+		Compress3( block );
 	
 		if( !m_colours->IsTransparent() )
 		{		
-			Compress4( start, end );
+			Compress4( block );
 		}
 	}
 	else
 	{
-		Compress4( start, end );
+		Compress4( block );
 	}
 }
 
diff --git a/src/nvtt/squish/colourfit.h b/src/nvtt/squish/colourfit.h
index 9e6281b..4c4dc6b 100644
--- a/src/nvtt/squish/colourfit.h
+++ b/src/nvtt/squish/colourfit.h
@@ -40,11 +40,11 @@ public:
 
 	void SetColourSet( ColourSet const* colours, int flags );
 
-	void Compress( Vec3 * start, Vec3 * end );
+	void Compress( void* block );
 
 protected:
-	virtual bool Compress3( Vec3 * start, Vec3 * end ) = 0;
-	virtual bool Compress4( Vec3 * start, Vec3 * end ) = 0;
+	virtual void Compress3( void* block ) = 0;
+	virtual void Compress4( void* block ) = 0;
 
 	ColourSet const* m_colours;
 	int m_flags;