diff --git a/ChangeLog b/ChangeLog
index a027adde..3c6160ea 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
  (Format: Year/Month/Day)
 Changes for 1.0rc3:
+*07/01/08:
+   * Fix another 64-bit window property (Mark/Simon)
+     FbTk/FbWindow.cc
 *07/01/07:
    * Update Iconbar Mode menu when updating settings (Mark)
      IconbarTool.cc
diff --git a/src/FbTk/FbWindow.cc b/src/FbTk/FbWindow.cc
index 4145b294..926abfd1 100644
--- a/src/FbTk/FbWindow.cc
+++ b/src/FbTk/FbWindow.cc
@@ -553,7 +553,7 @@ long FbWindow::eventMask() const {
 void FbWindow::setOpaque(unsigned char alpha) {
 #ifdef HAVE_XRENDER
     static Atom m_alphaatom = XInternAtom(display(), "_NET_WM_WINDOW_OPACITY", False);
-    unsigned int opacity = alpha * 0x1010101;
+    unsigned long opacity = alpha * 0x1010101;
     changeProperty(m_alphaatom, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &opacity, 1l);
 #endif // HAVE_XRENDER
 }