diff --git a/common/rfb/ComparingUpdateTracker.h b/common/rfb/ComparingUpdateTracker.h
index e62f2b2..ca1dcc3 100644
--- a/common/rfb/ComparingUpdateTracker.h
+++ b/common/rfb/ComparingUpdateTracker.h
@@ -50,7 +50,7 @@
     bool firstCompare;
     bool enabled;
 
-    rdr::U32 totalPixels, missedPixels;
+    unsigned long long totalPixels, missedPixels;
   };
 
 }