--- bindings/python/_preludedb.c~	2007-09-03 13:20:04.000000000 +0200
+++ bindings/python/_preludedb.c	2008-12-27 08:57:33.000000000 +0100
@@ -850,7 +850,7 @@
     Py_DECREF(old_str);
     Py_DECREF(value);
   } else {
-    PyErr_Format(PyExc_RuntimeError, mesg);
+    PyErr_Format(PyExc_RuntimeError, "%s", mesg);
   }
 }