diff --git a/IlmImf/ImfDwaCompressor.h b/IlmImf/ImfDwaCompressor.h
index 654ae790..ae80ca4e 100644
--- a/IlmImf/ImfDwaCompressor.h
+++ b/IlmImf/ImfDwaCompressor.h
@@ -71,7 +71,7 @@ class DwaCompressor: public Compressor

     virtual int numScanLines () const;

-    virtual Imf::Compressor::Format format () const;
+    virtual Format format () const;

     virtual int compress (const char *inPtr,
                           int         inSize,