diff --git a/win/rfb_win32/ToolBar.cxx b/win/rfb_win32/ToolBar.cxx
index 857db45..1bbba30 100644
--- a/win/rfb_win32/ToolBar.cxx
+++ b/win/rfb_win32/ToolBar.cxx
@@ -203,9 +203,9 @@
 }
 
 int ToolBar::getTotalWidth() {
-  SIZE *size;
-  SendMessage(getHandle(), TB_GETMAXSIZE, 0, (LPARAM)&size);
-  return size->cx;
+  SIZE size;
+  SendMessage(getHandle(), TB_GETMAXSIZE, 0, (LPARAM)(LPSIZE)&size);
+  return size.cx;
 }
 
 void ToolBar::show() {