diff --git a/src/mpsd_software_manager/spack.py b/src/mpsd_software_manager/spack.py
index f5b0bbee1247e7429b8f4f5dbe96b84e0cae5bf2..084ee49d19b8adecd58c16249ec1f68f97af6265 100644
--- a/src/mpsd_software_manager/spack.py
+++ b/src/mpsd_software_manager/spack.py
@@ -338,7 +338,10 @@ def refresh_modules(compilers: dict[str, Any] | None = None) -> None:
         module_file = Config().lmod_root / "Core" / intel_module
         family = CLASSIC_FAMILY if "classic" in intel_module else ONEAPI_FAMILY
 
-        modules_to_patch[module_file] = {"family": family, "gcc_module": gcc_module}
+        modules_to_patch[str(module_file)] = {
+            "family": family,
+            "gcc_module": gcc_module,
+        }
 
         if family == "intel_classic_compiler":
             # We need to also patch the intel module, which is loaded as a dependency of
@@ -359,7 +362,7 @@ def refresh_modules(compilers: dict[str, Any] | None = None) -> None:
                 )
                 raise ModuleGenerationError() from e
             oneapi_module_file = Config().lmod_root / "Core" / oneapi_module
-            modules_to_patch[oneapi_module_file] = {
+            modules_to_patch[str(oneapi_module_file)] = {
                 "family": ONEAPI_FAMILY,
                 "gcc_module": gcc_module,
             }
@@ -378,7 +381,7 @@ def refresh_modules(compilers: dict[str, Any] | None = None) -> None:
     for module_file in modules_to_patch:
         gcc_module = modules_to_patch["module_file"]["gcc_module"]
         family = modules_to_patch["module_file"]["family"]
-        patch_intel_module(module_file, gcc_module, family)
+        patch_intel_module(Path(module_file), gcc_module, family)
 
 
 def patch_intel_module(module_file: Path, gcc_module: str, family: str) -> None: