diff --git a/mypy/newsemanal/semanal.py b/mypy/newsemanal/semanal.py
index a8986c5444c8c..587386f27c368 100644
--- a/mypy/newsemanal/semanal.py
+++ b/mypy/newsemanal/semanal.py
@@ -1676,11 +1676,6 @@ def visit_import_from(self, imp: ImportFrom) -> None:
                     if self.process_import_over_existing_name(
                             imported_id, existing_symbol, node, imp):
                         continue
-                if (existing_symbol and isinstance(existing_symbol.node, MypyFile) and
-                        existing_symbol.no_serialize):  # submodule added to parent module
-                    # Special case: allow replacing submodules with variables. This pattern
-                    # is used by some libraries.
-                    del self.globals[imported_id]
                 if existing_symbol and isinstance(node.node, PlaceholderNode):
                     # Imports are special, some redefinitions are allowed, so wait until
                     # we know what is the new symbol node.