diff --git a/Objects/setobject.c b/Objects/setobject.c
index b4b1178..8a58d65 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -1548,9 +1548,15 @@
     if (PyDict_CheckExact(other)) {
         while (set_next(so, &pos, &entry)) {
             setentry entrycopy;
+            int rv;
             entrycopy.hash = entry->hash;
             entrycopy.key = entry->key;
-            if (!_PyDict_Contains(other, entry->key, entry->hash)) {
+            rv = _PyDict_Contains(other, entry->key, entry->hash);
+            if (rv < 0) {
+                Py_DECREF(result);
+                return NULL;
+            }
+            if (!rv) {
                 if (set_add_entry((PySetObject *)result, &entrycopy) == -1) {
                     Py_DECREF(result);
                     return NULL;
@@ -1793,7 +1799,8 @@
 static PyObject *
 set_richcompare(PySetObject *v, PyObject *w, int op)
 {
-    PyObject *r1, *r2;
+    PyObject *r1;
+    int r2;
 
     if(!PyAnySet_Check(w)) {
         Py_INCREF(Py_NotImplemented);
@@ -1812,9 +1819,11 @@
         r1 = set_richcompare(v, w, Py_EQ);
         if (r1 == NULL)
             return NULL;
-        r2 = PyBool_FromLong(PyObject_Not(r1));
+        r2 = PyObject_IsTrue(r1);
         Py_DECREF(r1);
-        return r2;
+        if (r2 < 0)
+            return NULL;
+        return PyBool_FromLong(!r2);
     case Py_LE:
         return set_issubset(v, w);
     case Py_GE: