diff --git a/scripts/stm32_mini_size.py b/scripts/stm32_mini_size.py
index 79cb33378..55718c987 100644
--- a/scripts/stm32_mini_size.py
+++ b/scripts/stm32_mini_size.py
@@ -12,7 +12,7 @@ if env["PIOENV"] == "wio-e5-mini_repeater":
     # Reuse the qualified RAK CLI's equivalent libc reply copies. Restrict
     # this flag to CommonCLI.cpp; radio, framework and other objects retain
     # the existing optimizer recipe.
-    source = Path(__file__).resolve().with_name("nrf52_flash_trim.py")
+    source = Path(env.subst("$PROJECT_DIR/scripts/nrf52_flash_trim.py")).resolve()
     spec = importlib.util.spec_from_file_location("mesh_mini_cli_replies", source)
     replies = importlib.util.module_from_spec(spec)
     spec.loader.exec_module(replies)
diff --git a/test/test_stm32_mini_repeater_profile.py b/test/test_stm32_mini_repeater_profile.py
index 91ca5ef6f..3e2e28242 100644
--- a/test/test_stm32_mini_repeater_profile.py
+++ b/test/test_stm32_mini_repeater_profile.py
@@ -159,6 +159,17 @@ class MiniRepeaterProfileTest(unittest.TestCase):
             other = Node(ROOT / path)
             self.assertIs(callback(environment, other), other)
 
+    def test_scons_script_context_without_file_still_installs_exact_cli_policy(self):
+        script = ROOT / "scripts/stm32_mini_size.py"
+        environment = FakeEnvironment(PIOENV=TARGET)
+        namespace = {"env": environment,
+                     "Import": lambda name: self.assertEqual(name, "env")}
+        exec(compile(script.read_text(), str(script), "exec"), namespace)
+        self.assertNotIn("__file__", namespace)
+        self.assertEqual(environment["LINKFLAGS"], list(LINK_SIZE_FLAGS))
+        self.assertEqual(len(environment.middleware), 1)
+        self.assertEqual(environment.middleware[0][1], "*CommonCLI.cpp")
+
     def test_capability_contract_declares_only_exact_mini_repeater_omissions(self):
         command = r'''
 set -euo pipefail