diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b457c411d..61b7f89044 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,11 @@ A brief description of the categories of changes:
 ### Removed
 * Nothing yet
 
+### Fixed
+* (bzlmod) get the path to the host python interpreter without calling
+  `mctx.path` on Labels that have differing contents on different OSes.
+* (bzlmod) correctly watch sources when using `pypi_repo_utils`.
+
 ## [0.35.0] - 2024-08-15
 
 [0.35.0]: https://github.com/bazelbuild/rules_python/releases/tag/0.35.0
diff --git a/examples/bzlmod/MODULE.bazel.lock b/examples/bzlmod/MODULE.bazel.lock
index 9252d4f077..cbd0489b28 100644
--- a/examples/bzlmod/MODULE.bazel.lock
+++ b/examples/bzlmod/MODULE.bazel.lock
@@ -1231,7 +1231,7 @@
     },
     "@@rules_python~//python/extensions:pip.bzl%pip": {
       "general": {
-        "bzlTransitiveDigest": "9GnLEprSx4ta69xVzCkTB+6C2HjuV7YVLcAiwY9TomQ=",
+        "bzlTransitiveDigest": "HapONJ1RAsxO/oKgr5ozho+SMJBUXnmCwv/Z2+irLYI=",
         "usagesDigest": "MChlcSw99EuW3K7OOoMcXQIdcJnEh6YmfyjJm+9mxIg=",
         "recordedFileInputs": {
           "@@other_module~//requirements_lock_3_11.txt": "a7d0061366569043d5efcf80e34a32c732679367cb3c831c4cdc606adc36d314",
@@ -1239,11 +1239,11 @@
           "@@//requirements_lock_3_10.txt": "5e7083982a7e60f34998579a0ae83b520d46ab8f2552cc51337217f024e6def5",
           "@@rules_python~~internal_deps~pypi__packaging//BUILD.bazel": "8d36246aeefaab4b26fb9c1175cfaf13df5b6f1587e6753f1e78b132bad74795",
           "@@//whl_mods/appended_build_content.BUILD": "87745b00382c66e5efbd7cb44a08fc3edbf7fd5099cf593f87599188f1557a9e",
-          "@@rules_python~~python~python_3_9_host//python": "3f2abf225fa30c9e1c16e1d07d8db0b8ef0d368c260d365c1366027b76d7e1b0",
           "@@//requirements_lock_3_9.txt": "ee8cf067b458c95ca9a417036b4b7c25332412738447dbd783cdc631344fca26",
           "@@rules_python~~internal_deps~pypi__packaging//packaging-24.0.dist-info/RECORD": "be1aea790359b4c2c9ea83d153c1a57c407742a35b95ee36d00723509f5ed5dd",
           "@@//requirements_windows_3_10.txt": "c79f04bfaca147b8330275911a3328b81fc80828b9050a6bebdb15477627dabc",
           "@@rules_python~//BUILD.bazel": "c421a2c2f3f428d2685a16eb9cc3fb8662605aba4ef151a87a356678bb7e866d",
+          "@@rules_python~~python~python_3_9_host//BUILD.bazel": "cf97d5763b728ce5ba8fdc3243350b967658ba4e3879734504aee002cec0d2b3",
           "@@rules_python~//python/private/pypi/requirements_parser/resolve_target_platforms.py": "42bf51980528302373529bcdfddb8014e485182d6bc9d2f7d3bbe1f11d8d923d"
         },
         "recordedDirentsInputs": {},
@@ -5910,7 +5910,7 @@
     },
     "@@rules_python~//python/private/pypi:pip.bzl%pip_internal": {
       "general": {
-        "bzlTransitiveDigest": "ObsRmNHKy0jYhsgsjPB1pDqpngC5yuUUTAWiOuHhvKk=",
+        "bzlTransitiveDigest": "AvN8NGX1Ou1eOlRF8GpQkRFf2GKGoTVHSYc9SLrWUbA=",
         "usagesDigest": "Y8ihY+R57BAFhalrVLVdJFrpwlbsiKz9JPJ99ljF7HA=",
         "recordedFileInputs": {
           "@@rules_python~//tools/publish/requirements.txt": "031e35d03dde03ae6305fe4b3d1f58ad7bdad857379752deede0f93649991b8a",
diff --git a/python/private/pypi/pypi_repo_utils.bzl b/python/private/pypi/pypi_repo_utils.bzl
index da449b4b50..196431636f 100644
--- a/python/private/pypi/pypi_repo_utils.bzl
+++ b/python/private/pypi/pypi_repo_utils.bzl
@@ -51,7 +51,20 @@ def _resolve_python_interpreter(mrctx, *, python_interpreter = None, python_inte
     python_interpreter = _get_python_interpreter_attr(mrctx, python_interpreter = python_interpreter)
 
     if python_interpreter_target != None:
-        python_interpreter = mrctx.path(python_interpreter_target)
+        # The following line would make the MODULE.bazel.lock platform
+        # independent, because the lock file will then contain a hash of the
+        # file so that the lock file can be recalculated, hence the best way is
+        # to add this directory to PATH.
+        #
+        # hence we add the root BUILD.bazel file and get the directory of that
+        # and construct the path differently. At the end of the day we don't
+        # want the hash of the interpreter to end up in the lock file.
+        if hasattr(python_interpreter_target, "same_package_label"):
+            root_build_bazel = python_interpreter_target.same_package_label("BUILD.bazel")
+        else:
+            root_build_bazel = python_interpreter_target.relative(":BUILD.bazel")
+
+        python_interpreter = mrctx.path(root_build_bazel).dirname.get_child(python_interpreter_target.name)
 
         os = repo_utils.get_platforms_os_name(mrctx)
 
@@ -110,7 +123,7 @@ def _execute_checked(mrctx, *, srcs, **kwargs):
         # This will ensure that we will re-evaluate the bzlmod extension or
         # refetch the repository_rule when the srcs change. This should work on
         # Bazel versions without `mrctx.watch` as well.
-        repo_utils.watch(mrctx.path(src))
+        repo_utils.watch(mrctx, mrctx.path(src))
 
     env = kwargs.pop("environment", {})
     pythonpath = env.get("PYTHONPATH", "")