diff --git a/amber/src/main/python/core/architecture/managers/executor_manager.py b/amber/src/main/python/core/architecture/managers/executor_manager.py
index 7f2249476ad..375033ad60c 100644
--- a/amber/src/main/python/core/architecture/managers/executor_manager.py
+++ b/amber/src/main/python/core/architecture/managers/executor_manager.py
@@ -99,6 +99,9 @@ def load_executor_definition(self, code: str) -> type(Operator):
             f"{Path(self.fs.getsyspath('/')).joinpath(file_name)}."
         )
 
+        # Clear importlib's directory listing cache so freshly written
+        # temporary modules are discoverable on systems with coarse mtime.
+        importlib.invalidate_caches()
         # gen_module_file_name guarantees module_name is unique across
         # the process, so import_module will always cleanly load source
         # from the tmp fs we just wrote — no re-import / reload dance.