diff --git a/Objects/genobject.c b/Objects/genobject.c
index 5643553..72aa872 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -1533,7 +1533,9 @@
     PyObject *result;
 
     if (o->ags_state == AWAITABLE_STATE_CLOSED) {
-        PyErr_SetNone(PyExc_StopIteration);
+        PyErr_SetString(
+            PyExc_RuntimeError,
+            "cannot reuse already awaited __anext__()/asend()");
         return NULL;
     }
 
@@ -1576,7 +1578,9 @@
     PyObject *result;
 
     if (o->ags_state == AWAITABLE_STATE_CLOSED) {
-        PyErr_SetNone(PyExc_StopIteration);
+        PyErr_SetString(
+            PyExc_RuntimeError,
+            "cannot reuse already awaited __anext__()/asend()");
         return NULL;
     }
 
@@ -1810,7 +1814,9 @@
 
     if (f == NULL || f->f_stacktop == NULL ||
             o->agt_state == AWAITABLE_STATE_CLOSED) {
-        PyErr_SetNone(PyExc_StopIteration);
+        PyErr_SetString(
+            PyExc_RuntimeError,
+            "cannot reuse already awaited aclose()/athrow()");
         return NULL;
     }
 
@@ -1932,7 +1938,9 @@
     PyObject *retval;
 
     if (o->agt_state == AWAITABLE_STATE_CLOSED) {
-        PyErr_SetNone(PyExc_StopIteration);
+        PyErr_SetString(
+            PyExc_RuntimeError,
+            "cannot reuse already awaited aclose()/athrow()");
         return NULL;
     }