--- bakefile-0.2.9/src/bkl_c_wrap.c~	2011-02-02 16:21:57.000000000 +0100
+++ bakefile-0.2.9/src/bkl_c_wrap.c	2012-12-12 12:30:12.717316507 +0100
@@ -850,7 +850,7 @@
     Py_DECREF(old_str);
     Py_DECREF(value);
   } else {
-    PyErr_Format(PyExc_RuntimeError, mesg);
+    PyErr_Format(PyExc_RuntimeError, "%s", mesg);
   }
 }