diff --git a/tests/launcher_test.py b/tests/launcher_test.py
index 7695910f..28ae1933 100644
--- a/tests/launcher_test.py
+++ b/tests/launcher_test.py
@@ -5981,6 +5981,18 @@ class ModsTest(Tmp):
         cheat.write_text('[Moon jump]\n04000000 00000000 D65F03C0\n')
         self.assertEqual(self.mods.code_waiting(self.game), ['Cheats'])  # edited since
 
+    def test_code_cheats_take_mains_base_from_the_layout(self):
+        """recomp/layout.py alone decides the modules' bases: tools/cheats.py decodes main's pc-relative code at the
+        base the layout gives main, the first module of its order, and follows it when it changes."""
+        import importlib
+        import cheats
+        import layout
+        self.assertEqual(layout.ORDER[0], 'main')
+        self.assertEqual(cheats.BASE, layout.FIRST_BASE)
+        self.addCleanup(importlib.reload, cheats)
+        with mock.patch.object(layout, 'FIRST_BASE', 0x7100000000):
+            self.assertEqual(importlib.reload(cheats).BASE, 0x7100000000)
+
     def test_the_mods_code_is_in_the_lift_key_and_not_the_shaders_key(self):
         import make_game
         kit = self.tmp / 'kit'
diff --git a/tools/cheats.py b/tools/cheats.py
index db0c9c58..dca459a7 100644
--- a/tools/cheats.py
+++ b/tools/cheats.py
@@ -40,11 +40,12 @@ from pathlib import Path
 sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'recomp'))
 sys.path.insert(0, str(Path(__file__).resolve().parent))
 import flags  # noqa: E402
+from layout import FIRST_BASE  # noqa: E402
 from lifter import Lifter, Unsupported  # noqa: E402
 from nso import Nso  # noqa: E402
 from mod_files import cheat_files  # noqa: E402
 
-BASE = 0x7000000000   # main's base in the layout (recomp/layout.py); only pc-relative decoding sees it
+BASE = FIRST_BASE   # main's base: recomp/layout.py lays main out first (ORDER); only pc-relative decoding sees it
 NOP = 0xD503201F
 RET = 0xD65F03C0