diff --git a/pykokkos/core/module_setup.py b/pykokkos/core/module_setup.py
index 3f294d02..d0d55005 100644
--- a/pykokkos/core/module_setup.py
+++ b/pykokkos/core/module_setup.py
@@ -140,7 +140,12 @@ def get_entity_dir(self, main: Path, metadata: EntityMetadata) -> Path:
         """
 
         filename: str = metadata.path.split("/")[-1].split(".")[0]
-        dirname: str = f"{filename}_{metadata.name}"
+        # the compilation paths do not have concurrent safety without a unique
+        # identifier because i.e., compilation units can share
+        # the same module/class; try using the memory loc of the Python
+        # metadata object
+        mem_id = id(metadata)
+        dirname: str = f"{filename}_{metadata.name}_{mem_id}"
 
         return self.get_main_dir(main) / Path(dirname)
 
@@ -180,4 +185,4 @@ def is_compiled(self) -> bool:
         Check if this module is compiled for its execution space
         """
 
-        return CppSetup.is_compiled(self.get_output_dir(self.main, self.metadata, self.space))
\ No newline at end of file
+        return CppSetup.is_compiled(self.get_output_dir(self.main, self.metadata, self.space))