diff --git a/include/boost/python/converter/from_python.hpp b/include/boost/python/converter/from_python.hpp
index 4fe240ce..f2680ef3 100644
--- a/include/boost/python/converter/from_python.hpp
+++ b/include/boost/python/converter/from_python.hpp
@@ -130,7 +130,7 @@ inline from_python_base::from_python_base(void* result)
 }
 
 inline from_python_base::from_python_base(
-    PyObject* const source
+    PyObject* source
     , lvalue_from_python_registration const* chain)
     : m_result(find(source, chain))
 {