diff --git a/src/poetry/core/utils/helpers.py b/src/poetry/core/utils/helpers.py
index 50e5a223c..8b1f40d91 100644
--- a/src/poetry/core/utils/helpers.py
+++ b/src/poetry/core/utils/helpers.py
@@ -17,7 +17,7 @@
 from poetry.core.version.pep440 import PEP440Version
 
 
-_canonicalize_regex = re.compile(r"[-_]+")
+_canonicalize_regex = re.compile(r"[-_.]+")
 
 
 def combine_unicode(string: str) -> str:
diff --git a/tests/utils/test_helpers.py b/tests/utils/test_helpers.py
index e61c2dbbe..9ffc28ac1 100644
--- a/tests/utils/test_helpers.py
+++ b/tests/utils/test_helpers.py
@@ -73,7 +73,7 @@ def test_parse_requires() -> None:
     assert result == expected
 
 
-@pytest.mark.parametrize("raw", ["a-b-c", "a_b-c", "a_b_c", "a-b_c"])
+@pytest.mark.parametrize("raw", ["a-b-c", "a_b-c", "a_b_c", "a-b_c", "a.b-c"])
 def test_utils_helpers_canonical_names(raw: str) -> None:
     assert canonicalize_name(raw) == "a-b-c"