diff --git a/common/rfb/Decoder.h b/common/rfb/Decoder.h
index 3840b3f..86ee4ef 100644
--- a/common/rfb/Decoder.h
+++ b/common/rfb/Decoder.h
@@ -27,9 +27,10 @@
 namespace rfb {
   class ConnParams;
   class ModifiablePixelBuffer;
-  class Rect;
   class Region;
 
+  struct Rect;
+
   enum DecoderFlags {
     // A constant for decoders that don't need anything special
     DecoderPlain = 0,