diff --git a/src/pl/plpython/plpy_main.c b/src/pl/plpython/plpy_main.c
index 8316b8d..35f15d9 100644
--- a/src/pl/plpython/plpy_main.c
+++ b/src/pl/plpython/plpy_main.c
@@ -161,6 +161,8 @@ PLy_init_interp(void)
 		PLy_elog(ERROR, "could not import module 'decimal'");
 
 	decimal_dict = PyModule_GetDict(decimal);
+	PLy_decimal_ctor_global = PyDict_GetItemString(decimal_dict, "Decimal");
+	Py_DECREF(decimal_dict);
 }
 
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