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