diff --git a/common/rfb/ZRLEEncoder.cxx b/common/rfb/ZRLEEncoder.cxx
index d3afe74..8917d8f 100644
--- a/common/rfb/ZRLEEncoder.cxx
+++ b/common/rfb/ZRLEEncoder.cxx
@@ -223,7 +223,7 @@
   pf.bufferFromPixel(pixBuf, maxPixel);
 
   if ((pf.bpp != 32) || ((pixBuf[0] != 0) && (pixBuf[3] != 0))) {
-    zos.writeBytes(buffer, count * pf.bpp/8);
+    zos.writeBytes(buffer, count * (pf.bpp/8));
     return;
   }