diff --git a/Orange/data/table.py b/Orange/data/table.py
index 0a44568f8bf..bffbfdc02db 100644
--- a/Orange/data/table.py
+++ b/Orange/data/table.py
@@ -348,7 +348,7 @@ def match_type(x):
                     cached = _conversion_cache.get((id(domain), id(source)))
                     if cached:
                         return cached
-                if domain == source.domain:
+                if domain is source.domain:
                     return cls.from_table_rows(source, row_indices)
 
                 if isinstance(row_indices, slice):