lib/DiffractionImage/DiffractionImagePythonInterface.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/DiffractionImage/DiffractionImagePythonInterface.cpp b/lib/DiffractionImage/DiffractionImagePythonInterface.cpp
index f729fc5..4c24e82 100755
--- a/lib/DiffractionImage/DiffractionImagePythonInterface.cpp
+++ b/lib/DiffractionImage/DiffractionImagePythonInterface.cpp
@@ -867,7 +867,7 @@ 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);
   }
 }