diff --git a/python/aubio/aubio_wrap.c b/python/aubio/aubio_wrap.c
index 3a2380e..060b8af 100644
--- a/python/aubio/aubio_wrap.c
+++ b/python/aubio/aubio_wrap.c
@@ -844,7 +844,7 @@ SWIG_Python_AddErrorMsg(const char* mesg)
     Py_DECREF(old_str);
     Py_DECREF(value);
   } else {
-    PyErr_Format(PyExc_RuntimeError, mesg);
+    PyErr_Format(PyExc_RuntimeError, "%s", mesg);
   }
 }