diff --git a/src/ep_util.c b/src/ep_util.c
index 456b5a8..f4a1c3a 100644
--- a/src/ep_util.c
+++ b/src/ep_util.c
@@ -64,6 +64,7 @@ HRESULT Epython_register_constants(PyObject *module, PCREGCONSTANT const_table)
 	}
 	if (!rc)
 	{
+	  Log(LERROR, "Failed to register constant %s", const_table[i].name);
 	  hr = E_FAIL;
 	  break;
 	}