1 files changed, 4 insertions, 3 deletions

diff --git a/linden/indra/llimage/llimagepng.h b/linden/indra/llimage/llimagepng.h
index 7ca59cf..9d45fb0 100644
--- a/linden/indra/llimage/llimagepng.h
+++ b/linden/indra/llimage/llimagepng.h
@@ -42,9 +42,10 @@ protected:
 public:
         LLImagePNG();
 
-        BOOL updateData();
-        BOOL decode(LLImageRaw* raw_image, F32 decode_time);
-        BOOL encode(const LLImageRaw* raw_image, F32 encode_time);
+        /*virtual*/ std::string getExtension() { return std::string("png"); }
+        /*virtual*/ BOOL updateData();
+        /*virtual*/ BOOL decode(LLImageRaw* raw_image, F32 decode_time);
+        /*virtual*/ BOOL encode(const LLImageRaw* raw_image, F32 encode_time);
 
 private:
         U8* mTmpWriteBuffer;