diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index 3ad1c9ef1fa..ff2440554bf 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -362,7 +362,7 @@ get_ulong(PyObject *v, unsigned long *p)
 		return -1;
 	}
 	x = PyLong_AsUnsignedLongMask(v);
-	if (x == -1 && PyErr_Occurred())
+	if (x == (unsigned long)-1 && PyErr_Occurred())
 		return -1;
 	*p = x;
 	return 0;
@@ -400,7 +400,7 @@ get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
  		return -1;
  	}
 	x = PyLong_AsUnsignedLongLongMask(v);
-	if (x == -1 && PyErr_Occurred())
+	if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())
 		return -1;
 	*p = x;
 	return 0;
diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index 2718b6942ca..05c09d84105 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -355,7 +355,7 @@ random_setstate(RandomObject *self, PyObject *state)
 
 	for (i=0; i<N ; i++) {
 		element = PyLong_AsUnsignedLong(PyTuple_GET_ITEM(state, i));
-		if (element == -1 && PyErr_Occurred())
+		if (element == (unsigned long)-1 && PyErr_Occurred())
 			return NULL;
 		self->state[i] = element & 0xffffffffUL; /* Make sure we get sane state */
 	}