diff --git a/pyalsa/alsahcontrol.c b/pyalsa/alsahcontrol.c
index 70e3476..b025d3e 100644
--- a/pyalsa/alsahcontrol.c
+++ b/pyalsa/alsahcontrol.c
@@ -1172,10 +1172,8 @@ pyalsahcontrolvalue_settuple(struct pyalsahcontrolvalue *self, PyObject *args)
 			return NULL;
 		}
 		iec958 = calloc(1, sizeof(*iec958));
-		if (iec958 == NULL) {
-			Py_DECREF(t);
+		if (iec958 == NULL)
 			Py_RETURN_NONE;
-		}
 		v = !list ? PyTuple_GET_ITEM(t, 0) : PyList_GetItem(t, 0);
 		Py_INCREF(v);
 		if (!PyBytes_Check(v))
diff --git a/pyalsa/alsamixer.c b/pyalsa/alsamixer.c
index 47c634b..1a5e42a 100644
--- a/pyalsa/alsamixer.c
+++ b/pyalsa/alsamixer.c
@@ -724,7 +724,6 @@ pyalsamixerelement_setvolumetuple(struct pyalsamixerelement *pyelem, PyObject *a
 				 PyErr_Format(PyExc_RuntimeError, "Cannot set mixer volume (capture=%s, channel=%i, value=%li): %s", dir ? "True" : "False", i, val, snd_strerror(-res));
 		}
 	}
-	Py_DECREF(t);
 	Py_RETURN_NONE;
 }
 
@@ -937,7 +936,6 @@ pyalsamixerelement_setswitchtuple(struct pyalsamixerelement *pyelem, PyObject *a
 		if (res < 0)
 			 PyErr_Format(PyExc_RuntimeError, "Cannot set mixer switch (capture=%s, channel=%i, value=%i): %s", dir ? "True" : "False", i, val, snd_strerror(-res));
 	}
-	Py_DECREF(t);
 	Py_RETURN_NONE;
 }