diff --git a/src/nvimage/BlockDXT.cpp b/src/nvimage/BlockDXT.cpp
index e3a269a..25fd64d 100644
--- a/src/nvimage/BlockDXT.cpp
+++ b/src/nvimage/BlockDXT.cpp
@@ -263,6 +263,14 @@ void BlockDXT3::decodeBlock(ColorBlock * block) const
 	alpha.decodeBlock(block);
 }
 
+void BlockDXT3::decodeBlockNV5x(ColorBlock * block) const
+{
+	nvDebugCheck(block != NULL);
+	
+	color.decodeBlockNV5x(block);
+	alpha.decodeBlock(block);
+}
+
 void AlphaBlockDXT3::decodeBlock(ColorBlock * block) const
 {
 	nvDebugCheck(block != NULL);
diff --git a/src/nvimage/BlockDXT.h b/src/nvimage/BlockDXT.h
index b4deefa..1603072 100644
--- a/src/nvimage/BlockDXT.h
+++ b/src/nvimage/BlockDXT.h
@@ -107,6 +107,7 @@ namespace nv
 		BlockDXT1 color;
 		
 		void decodeBlock(ColorBlock * block) const;
+		void decodeBlockNV5x(ColorBlock * block) const;
 		
 		void flip4();
 		void flip2();