diff --git a/python/sdist/amici/__init__.py b/python/sdist/amici/__init__.py
index f8776d8ba6..ee78a6045b 100644
--- a/python/sdist/amici/__init__.py
+++ b/python/sdist/amici/__init__.py
@@ -148,7 +148,10 @@ def get_jax_model(self) -> JAXModel: ...
 
 
 class add_path:
-    """Context manager for temporarily changing PYTHONPATH"""
+    """Context manager for temporarily changing PYTHONPATH.
+
+    Add a path to the PYTHONPATH for the duration of the context manager.
+    """
 
     def __init__(self, path: str | Path):
         self.path: str = str(path)
@@ -162,6 +165,23 @@ def __exit__(self, exc_type, exc_value, traceback):
             sys.path.remove(self.path)
 
 
+class set_path:
+    """Context manager for temporarily changing PYTHONPATH.
+
+    Set the PYTHONPATH to a given path for the duration of the context manager.
+    """
+
+    def __init__(self, path: str | Path):
+        self.path: str = str(path)
+
+    def __enter__(self):
+        self.orginal_path = sys.path.copy()
+        sys.path = [self.path]
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        sys.path = self.orginal_path
+
+
 def import_model_module(
     module_name: str, module_path: Path | str
 ) -> ModelModule:
@@ -253,7 +273,7 @@ def import_model_module(
         for m in to_unload:
             del sys.modules[m]
 
-    with add_path(module_path):
+    with set_path(module_path):
         return importlib.import_module(module_name)