diff --git a/radiant/undo.cpp b/radiant/undo.cpp
index 40bbcfb4..503c1e08 100644
--- a/radiant/undo.cpp
+++ b/radiant/undo.cpp
@@ -506,6 +506,10 @@ void Undo_EndBrushList(brush_t *brushlist)
 	for (brush_t* pBrush = brushlist->next; pBrush != NULL && pBrush != brushlist; pBrush=pBrush->next)
 	{
 		pBrush->undoId = g_lastundo->id;
+		// http://github.com/mfn/GtkRadiant/commit/ee1ef98536470d5680bd9bfecc5b5c9a62ffe9ab
+		if ( pBrush->owner->eclass->fixedsize == 1 ) {
+		  pBrush->owner->undoId = pBrush->undoId;
+		}
 	}
 }