diff --git a/Lib/compileall.py b/Lib/compileall.py
@@ -206,8 +206,8 @@ def compile_file(fullname, ddir=None, force=False, rx=None, quiet=0,
            if not force:
                try:
                    mtime = int(os.stat(fullname).st_mtime)
-                    expect = struct.pack('<4sll', importlib.util.MAGIC_NUMBER,
-                                         0, mtime)
                    for cfile in opt_cfiles.values():
                        with open(cfile, 'rb') as chandle:
                            actual = chandle.read(12)

diff --git a/Lib/test/test_compileall.py b/Lib/test/test_compileall.py
@@ -55,9 +55,28 @@ def timestamp_metadata(self):
        with open(self.bc_path, 'rb') as file:
            data = file.read(12)
        mtime = int(os.stat(self.source_path).st_mtime)
-        compare = struct.pack('<4sll', importlib.util.MAGIC_NUMBER, 0, mtime)
        return data, compare

    def recreation_check(self, metadata):
        """Check that compileall recreates bytecode when the new metadata is
        used."""
@@ -76,7 +95,7 @@ def recreation_check(self, metadata):

    def test_mtime(self):
        # Test a change in mtime leads to a new .pyc.
-        self.recreation_check(struct.pack('<4sll', importlib.util.MAGIC_NUMBER,
                                          0, 1))

    def test_magic_number(self):

diff --git a/Misc/NEWS.d/next/Library/2020-04-24-20-39-38.bpo-34990.3SmL9M.rst b/Misc/NEWS.d/next/Library/2020-04-24-20-39-38.bpo-34990.3SmL9M.rst
@@ -0,0 +1,2 @@