diff --git a/win/rfb_win32/DeviceContext.cxx b/win/rfb_win32/DeviceContext.cxx
index ad5e6b1..da19de8 100644
--- a/win/rfb_win32/DeviceContext.cxx
+++ b/win/rfb_win32/DeviceContext.cxx
@@ -127,6 +127,10 @@
     if (bpp < 8)
       bpp = 8;
     vlog.info("%d-colour palettised", 1<<depth);
+    // Aren't really used, but set them to keep the compiler happy
+    redMax = redShift = 0;
+    greenMax = greenShift = 0;
+    blueMax = blueShift = 0;
   }