diff --git a/src/if_python.c b/src/if_python.c
index 7b82a7f..f8e72f5 100644
--- a/src/if_python.c
+++ b/src/if_python.c
@@ -1125,6 +1125,9 @@
 {
     PyObject *r;
 
+    if ((r = BufferAttrValid((BufferObject *)(self), name)))
+	return r;
+
     if (CheckBuffer((BufferObject *)(self)))
 	return NULL;
 
@@ -1206,6 +1209,9 @@
 {
     PyObject *r;
 
+    if ((r = TabPageAttrValid((TabPageObject *)(self), name)))
+	return r;
+
     if (CheckTabPage((TabPageObject *)(self)))
 	return NULL;
 
@@ -1224,6 +1230,9 @@
 {
     PyObject *r;
 
+    if ((r = WindowAttrValid((WindowObject *)(self), name)))
+	return r;
+
     if (CheckWindow((WindowObject *)(self)))
 	return NULL;