diff --git a/win/rfb_win32/DeviceFrameBuffer.cxx b/win/rfb_win32/DeviceFrameBuffer.cxx
index 921e1fa..cc9bbca 100644
--- a/win/rfb_win32/DeviceFrameBuffer.cxx
+++ b/win/rfb_win32/DeviceFrameBuffer.cxx
@@ -276,7 +276,7 @@
     server->setCursor(cursor.width(), cursor.height(), cursor.hotspot,
                       cursorBm.data, cursor.mask.buf);
   } catch (rdr::Exception& e) {
-    vlog.error(e.str());
+    vlog.error("%s", e.str());
   }
 }