diff --git a/project/vc12/nvconfig.h b/project/vc12/nvconfig.h
index 863a1d3..18c31fa 100644
--- a/project/vc12/nvconfig.h
+++ b/project/vc12/nvconfig.h
@@ -2,21 +2,21 @@
 #define NV_CONFIG
 
 //#cmakedefine HAVE_UNISTD_H
-#define HAVE_STDARG_H
+//#define HAVE_STDARG_H
 //#cmakedefine HAVE_SIGNAL_H
 //#cmakedefine HAVE_EXECINFO_H
-#define HAVE_MALLOC_H
+//#define HAVE_MALLOC_H
 
 #if defined(_OPENMP)
 #define HAVE_OPENMP
 #endif
 
-#define HAVE_STBIMAGE
+#define NV_HAVE_STBIMAGE
 /*#if !defined(_M_X64)
-//#define HAVE_FREEIMAGE
-#define HAVE_PNG
-#define HAVE_JPEG
-#define HAVE_TIFF
+//#define NV_HAVE_FREEIMAGE
+#define NV_HAVE_PNG
+#define NV_HAVE_JPEG
+#define NV_HAVE_TIFF
 #endif*/
 
 #endif // NV_CONFIG
diff --git a/src/nvtt/Surface.cpp b/src/nvtt/Surface.cpp
index 41421ca..eac61ba 100644
--- a/src/nvtt/Surface.cpp
+++ b/src/nvtt/Surface.cpp
@@ -634,7 +634,7 @@ bool Surface::load(const char * fileName, bool * hasAlpha/*= NULL*/)
     }
 
     // @@ Have loadFloat allocate the image with the desired number of channels.
-    //img->resizeChannelCount(4);
+    img->resizeChannelCount(4); // Block compressors expect a 4 channel texture.
 
     delete m->image;
     m->image = img.release();