diff --git a/src/python_discovery/_py_spec.py b/src/python_discovery/_py_spec.py
index 937d075..f0fb53e 100644
--- a/src/python_discovery/_py_spec.py
+++ b/src/python_discovery/_py_spec.py
@@ -17,7 +17,7 @@
     (?P<version>[0-9.]+)?           # version (e.g. 3.12, 3.12.1)
     (?P<threaded>t)?                # free-threaded flag
     (?:-(?P<arch>32|64))?           # architecture bitness
-    (?:-(?P<machine>[a-zA-Z0-9_]+))?  # ISA (e.g. arm64, x86_64)
+    (?:-(?P<machine>[a-zA-Z0-9_.]+))?  # ISA (e.g. arm64, x86_64, i86pc.64bit)
     $
     """,
     re.VERBOSE,
diff --git a/tests/test_py_spec.py b/tests/test_py_spec.py
index b89fd2a..a616622 100644
--- a/tests/test_py_spec.py
+++ b/tests/test_py_spec.py
@@ -180,6 +180,7 @@ def test_specifier_satisfies_with_partial_information() -> None:
         pytest.param("cpython3.12-64", None, id="no-machine"),
         pytest.param("cpython3.12", None, id="no-arch-no-machine"),
         pytest.param("python3.12-64-arm64", "arm64", id="python-impl"),
+        pytest.param("cpython3.14-64-i86pc.64bit", "i86pc.64bit", id="dotted-machine"),
     ],
 )
 def test_spec_parse_machine(spec_str: str, expected_machine: str | None) -> None: