diff --git a/Stackless/changelog.txt b/Stackless/changelog.txt
index 298621ba8efffa..0f455c49bede1f 100644
--- a/Stackless/changelog.txt
+++ b/Stackless/changelog.txt
@@ -9,6 +9,10 @@ What's New in Stackless 3.X.X?
 
 *Release date: 20XX-XX-XX*
 
+- https://github.com/stackless-dev/stackless/issues/265
+  Fix C-API functions PyChannel_Send() and PyChannel_Send_nr() for calls from
+  outside of the interpreter (with no main-tasklet).
+
 - https://github.com/stackless-dev/stackless/issues/264
   Implement bpo-35134 for Stackless: move header Include/slp_tstate.h to
   Include/cpython/slp_tstate.h.
diff --git a/Stackless/module/channelobject.c b/Stackless/module/channelobject.c
index f3c26731ddfa23..4ce9678646ab51 100644
--- a/Stackless/module/channelobject.c
+++ b/Stackless/module/channelobject.c
@@ -425,10 +425,13 @@ the sender will be blocked. Otherwise, the receiver will\n\
 be activated immediately, and the sender is put at the end of\n\
 the runnables list.");
 
+static PyObject *
+impl_channel_send(PyChannelObject *self, PyObject *arg);
+
 static PyObject *
 PyChannel_Send_M(PyChannelObject *self, PyObject *arg)
 {
-    PyMethodDef def = {"send", (PyCFunction)PyChannel_Send, METH_O};
+    PyMethodDef def = {"send", (PyCFunction)impl_channel_send, METH_O};
     return PyStackless_CallCMethod_Main(&def, (PyObject *) self, "O", arg);
 }